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  1. 2 points
    Raster Conversion from ArcGIS into IDRISI There are multiple ways to accomplish this task, one of the simplest being to use the ‘Raster to ASCII’ tool in ArcGIS to generate an ASCII file from the Arc grid image, and then import into IDRISI with the ARCRASTER importing tool specifying the ‘ArcInfo ASCII to Raster’ setting. Alternatively you can opt to export the Arc grid file as an ERDAS Imagine file (*.img) and then import that file into IDRISI. To do this use the export function in the ArcGIS environment, right click the grid file and select Data> Export Data. Here specify the format for the image to be exported as *.img. Select any other settings that are necessary for your file. Now in the folder you specified for the output location you should have a *.img file. Moving to the IDRISI environment, set that folder where the *.img file is stored as your resource folder and the folder you want to be storing your working data in as your working folder. Go to File> Import> Software Specific Files> ERDAS. Choose you *.img file and give it an output name. Press OK. Once the conversion is complete you will see your *.rst file in your working folder. Lastly If you still have problems importing raster formats, including tif, you should try using the GDAL interface in IDRISI. Tif in particular, comes in many different flavours and can be problematic. Also, before you use GDAL, make sure you get the latest drivers from the clark website - http://clarklabs.org/support/gdal.cfm Follow the directions in the Help on configuring GDAL within IDRISI. If you still problems with GDAL and IDRISI imports, consider saving the data in another format and ensure that the datatype of the imported data is supported by IDRISI.
  2. 2 points
    It could be the correct approach, but it's basic or applied research that will take trial and error through scientific process. There is no canned answer. There are plenty of studies that support NDVI, or other vegetation indices (both narrow and broadband), serving as a proxy for crop health, vigor, LAI, etc. Red edge has also shown promise in detecting the subtleties between a green, healthy plant and a relatively green, unhealthy plant. The common denominator among these studies are field data; field data that has been collected in a meaningful and statistically rigorous manner so you can model the relationship between a vegetation index and the phenomenon of interest, in this case blight. Have you collected ground truth data on plants with blight and plants without? Can this be discerned at the spatial resolution that you are collecting at (5 meter overhead)? If you find this out and can recommend optimal collection parameters and methods using UAS to detect blight, then I highly suggest that you publish your results.
  3. 2 points
    I hope that some of these books will be useful to this topic...... Quadcopters and Drones: A Beginner's Guide to Successfully Flying and Choosing the Right Drone by Mark D Smith http://avxhome.se/ebooks/1514708426.html How to Build a Quadcopter Drone: Everything you need to know about building your own Quadcopter Drone incorporated with pictures as a complete step-by-step guide. by Scott Russon http://avxhome.se/ebooks/B01COSMYMC.html Drone Masterclass: Your Complete Guide to DJI Drones MP4 | Video: AVC 1280x720 | Audio: AAC 44KHz 2ch | Duration: 2 Hours | 1.85 GB Genre: eLearning | Language: English http://avxhome.se/ebooks/naag9136.html John Baichtal, "Building Your Own Drones: A Beginners' Guide to Drones, UAVs, and ROVs" http://avxhome.se/ebooks/078975598X.html Drones and Unmanned Aerial Systems: Legal and Social Implications for Security and Surveillance http://avxhome.se/ebooks/Politics_Sociology/Drones-Unmanned-Aerial-Systems-Implications.html Drones For Benefits: Guide about different types of drones with details by Nauman Ashraf http://avxhome.se/ebooks/B01BPFUXTQ.html Drones The Complete Manual 1st Edition http://avxhome.se/ebooks/DronesTheCompleteManual1stEdition.html Drones: Learn Aerial Photography and Videography Basics http://avxhome.se/ebooks/naag9492.html Aerial Photography and Videography Using Drones - Learn by Video Duration: Over 1 hour | Video: h264, yuv420p, 1920x1080 30fps | Audio: aac, 44100 Hz, 2ch | 1.04 GB Genre: eLearning | Language: English http://avxhome.se/ebooks/c2u2016555.html Drones: Personal Guide to Drones - Camera, Airframe, Radio & Power by Harry Jones http://avxhome.se/ebooks/1523710810.html Drones: Personal Guide to Drones - Camera, Airframe, Radio & Power by Harry Jones http://avxhome.se/ebooks/engeneering_technology/electronics/3829239.html Aerial Photography and Videography Using Drones by Eric Cheng http://avxhome.se/ebooks/0134122771.html Skillshare - Introduction to Aerial Videography: Creative Direction for Drone Filming http://avxhome.se/ebooks/Photo_related/IntroductionAerialVideography.html Grégoire Chamayou, "A Theory of the Drone" http://avxhome.se/ebooks/history_military/1595589759.html The Editors of Make, "DIY Drone and Quadcopter Projects: A Collection of Drone-Based Essays, Tutorials, and Projects" http://avxhome.se/ebooks/1680451294.html Drone Building Document by Bakanou Dragon http://avxhome.se/ebooks/B01C69WOCO.html Make: Getting Started with Drones: Build and Customize Your Own Quadcopter by Terry Kilby http://avxhome.se/ebooks/engeneering_technology/electronics/3708860.html The Drones Book 2nd Edition http://avxhome.se/ebooks/TheDronesBook2ndEdition.html UAV Drone Photos to Google Street Contributor http://avxhome.se/ebooks/naag8234.html Building Multicopter Video Drones by Ty Audronis http://avxhome.se/ebooks/engeneering_technology/electronics/34277063427706.html By 2026, Air Traffic Control for Drone Traffic in the USA as Drones Surpasses One Billion: Powered by Qmax-17.0 M. Lawrence Think Tank Solution Cortex by M. LAWRENCE http://avxhome.se/ebooks/B01DJB80UI.html Getting Started with Hobby Quadcopters and Drones: Learn about, buy and fly these amazing aerial vehicles by Craig S Issod http://avxhome.se/ebooks/engeneering_technology/electronics/3763899.html Drones: Step by step to build and fly a racing quadcopter. English | 2015 | mp4 | H264 1280x720 | AAC 2 ch | 5 hrs | pdf | 3.1 GB http://avxhome.se/ebooks/personality/Dronestepytep.html Udemy - UAV Drones: Precision Agriculture http://avxhome.se/ebooks/eLearning/uav-drones-precision-agriculture.html John Glover, "Drone University" http://avxhome.se/ebooks/0692316035.html Cinematic Drone Video Post-Production .MP4, AVC, 1000 kbps, 1280x720 | English, AAC, 64 kbps, 2 Ch | 1.4 hours | 1.29 GB Instructor: Charles Yeager http://avxhome.se/ebooks/cinematic-drone-video-post-production.html Ultimate guide to starting your own aerial filming business MP4 | Video: AVC 1280x720 | Audio: AAC 44KHz 2ch | Duration: 9 Hours | 5.22 GB Genre: eLearning | Language: English http://avxhome.se/ebooks/eLearning/naag7993.html
  4. 1 point
    Check my latest fixes (updated 5th September 2018) - http://www.mediafire.com/file/61joa3j8u4e51ii/list.txt
  5. 1 point
    Hi, Please check out this tool - https://www.whatiswhere.com, which can be very useful in your research. Features: * OpenStreetMap based search which allows you to apply more than 1 criteria at once * Negative conditions (e.g. you could search for areas where some type of POI does not exist) * Access to global postal code information * EXPORT RESULTS TO CSV, which can be then uploaded to your GIS * Re-use of search projects Thanks, Andrei, WhatIsWhere www.whatiswhere.com
  6. 1 point
  7. 1 point
    1. For the shadow, it will make the NDVI values close to zero, whatever the landcover covered by it 2. for level 1C data, the digital number/reflectance is processed to top of atmosphere value, which means atmospheric effect is not yet corrected, and for level 2A, the digital number/reflectance has been corrected to surface/bottom of atmosphere reflectance (atmospheric effects has been corrected). Theoretically , the level 2A data will give more accurate NDVI values compared to level 1C,
  8. 1 point
    it could be related to coordinate and projection, if your file empty
  9. 1 point
    Myself Medmaker, I am originally from Russia/Ukraine region. Basically a part-time Reverse Engineer and am into RE of Engg software for last 15 years. Off late, have been working on some private and public solutions for geomatics industry. Nice to been here and hope to know you all well. Thanks, Medmaker
  10. 1 point
    At last QGIS v3 Girona is here. Change log Download from here
  11. 1 point
    Hi upay82 Thank you very much for the technique to solve the problem. I have done it!!!! Thanks alot upay82
  12. 1 point
    I know one initiative who are doing similar project with Wageningen University. They have successfully done few similar work in Natherlands. This project is using Sentinel-2 image and combining that with local weather information to calculate late-blight disease vulnerability index. The project implements IDL and Python to automate the RS analysis. So far I know, this disease is highly dependent on moisture and temperature, and potato fields are relatively easy to identify from RS data. We are doing something similar, but for paddy. There might be some algorithms already which you need to research.
  13. 1 point
    So far, I have collected data on plants with blight(in a test field), but I will collect data on plants without blight in the coming season. And, yes if I find this out, I'll certainly publish my results. And I appreciate your response to my question.
  14. 1 point
    There are no 'best option' for MCDM. Each method has their own pros and cons. Try with something simpler, ie. AHP.
  15. 1 point
    PCI Geomatics - OrthoEngine - Aerial Photographs Using PCI OrthoEngine - Learn how to work with scanned historical air photos in the Historical Airphoto Processing (HAP) module of Geomatica to create accurate ortho mosaics that can provide the ability to perform change detection and extract features of interest. Links to Additional info - hope this helps you in your project
  16. 1 point
    It’s been a while since ESRI announced ArcGIS Pro, a clean and revamped version of the ArcGIS Desktop. After a long exhaustive wait for a proper 64-bit geoprocessing and mapping environment ESRI has finally introduced something completely modified out of the scratch. This new version has a lot of new and interesting feature – can visualize, edit, and perform analysis in both 2D and 3D, it’s multithreaded and support 64-bit processing, new set of symbols, tools, workflows in a completely new user interface. There is a lot of excitements in everywhere for this new application. So I decided to download the trial version of ArcGIS Pro 1.1 and have a look. ArcGIS Pro: First impression ESRI lets you register for a trial license of ArcGIS Pro for 60 days along with few essential extension. You will get the link of the trial download page and the ArcGIS Online account at your confirmation email. Once inside the ArcGIS Online account, you will have to set the privilege for the license type and extensions. Installing the application is quite straightforward, use the same username and password to start ArcGIS Pro. We don’t want the program to login to the account and check for license in each startup. In Project menu, under Licensing select Authorize ArcGIS Pro to work offline. ArcGIS Pro has some difficulty with any preinstalled Python, so if you already have a python installed disable your PYTHONPATH for the time being. At this stage you will meet a window to create and edit map projects. I decided to create a Map.aptx called MyProject. Throughout this demonstration you will meet a lot of new file types and workflows like this. ArcGIS Pro is a 64-bit software, no support for 32-bit PCs. ESRI wanted to introduce a lot of new workflow mechanism and toolchain activities which is different in ArcGIS Desktop. ‘ArcMap Document’ is now ‘Project’, ‘toolbox’ is ‘geoprocessing’, ‘table of content’ and ‘attribute table’ both lost ‘table’ from their names. The ‘content’ window can list features by their snapping status and label class. Moreover, both DirectX and OpenGL options are available for display rendering. You have the freedom to change this interface completely. But before that you will need some time to find all the useful features, and there is no global search option to help you out. A side by side comparison of all these new tools can be found here. Some of the smallest and most essential utilities now has something new. The snapping toolbar has three more option – the intersection snapping, midpoint snapping and tangent snapping. The measurement tool looks better now. The layer context menu has most of the useful options. The new ‘Attribute table’ has a new look and feel. The ‘Calculate geometry’ window is now a geoprocessing tool. The ‘Definition query’ has also improved. The ‘Geoprocessing tools’ aka ‘Toolbox’ lists all recently used ones under favorite tab. The ‘Analysis gallery’ is as good as ‘Favorites’. I couldn’t find two of the most useful toolbox options – batch and debug. The ‘Task’ tool can be way around. Starting a “GIS job” Projects are a new way of organizing everything related to your map. The Projects (.aprx) lets you start your work in blank or with preinstalled templates. ArcGIS Pro can import your .mxd, .sdx and .3dd files and converts them to its own format. So do not expect your .mxd’s will function without any glitch, besides Python 3 is in action. Projects can even be shared like Map Packages (.mpk). The ‘Symbology’ is no longer attached to the context menu. ‘Colorbrewer’ is now a part of symbology color scheme. You have all the essential symbology options available, but not the styles as it is in ArcGIS Desktop. The ‘graduated symbol’ in my pc crashed sometime. I couldn’t find the chart option. The labeling toolbar tried hard to home all the familiar choices in one place. You have a truck-load of fonts, but limited font styles. I was hoping not only for a prettier but also an intelligent labeling system. Editing and geoprocessing Edit whenever you like, no starting and stopping editing (which may cause accidental edit, so be careful). The small ‘editing status’ utility will help you to identify any edit time complexities. Templates can be a very powerful tool. The floating ‘tool feedback’ does its work. I couldn’t locate the advanced editing features (ie. COGO, Percel editing, Topology etc). The geoprocessing capability has been the crown jewel of ArcGIS Desktop since its beginning. It’s the simplicity and robustness of the ‘Arc toolbox’ which made it the number one choice of all the GIS professionals for decades. In ArcGIS Pro, these tools remained in their boxes with very little changes. The tools can now dock together and ‘actually’ show progress bar. The geoprocessing history shows all the messages, errors and statuses in one place. Here is list of all the tools those are currently not available. As mentioned before, the ‘Task’ feature can work instead of batch option. What is task? A task is a set of preconfigured steps that guide you and others through a workflow or business process. A task can be used to implement a best-practice workflow, improve the efficiency of a workflow, or create a series of interactive tutorial steps. – as described by the website. Tasks are easy to create and can also be shared. It can be used to create an automated workflow to work for similar geoprocessing request which operates and manages different other processes or groups. This is a very promising addition, I will look forward for more. The ‘Modelbuilder’ has its charm in a separate pane. The ‘merge branches’ can merge multiple logical branches into single output. The color scheme changed a bit. The Python scripting functionality is one of the most powerful extension of ArcGIS family. In ArcGIS Pro the Python windows has a lot of new feature. The scripts are not only has autocomplete feature but also show helpful tool tips. Any geoprocessing that has run on Python window will show up in the current project’s Geoprocessing history. Script is taking too long to run – hit the cross to stop that immediately. To make the operation breeze the Python window works with any file, tools and layers by simply dragging and dropping them inside the window. Working with raster data has found some new functionality since ArcGIS Desktop 10. Part of this process ArcGIS Pro has all the raster geoprocessing tools in a new window. Other options are distributed is many other windows but remain almost same. Raster functionalities of ArcGIS Pro are not something most of us should get eager about when programs like GRASS and Monteverdi has more tools than this and are absolutely free. Layout making The layout making workflow in ArcGIS Pro doesn’t seem to be much organized. Besides there is currently no option to add grids to the layout. In ArcGIS Desktop layers are automatically added to a map frame, here you need to specify a Map frame which doesn’t seem much intuitive. The north-arrow and scale bars are as usual, so does the legend. The maps and layout styles now a days changed a lot, the scale bars now have multiple units, legends are more stylish. Even though ArcGIS Pro is a mapping suit of 2015, it seems to have styles from 90’s. But there is something new, dynamic texts now can use information directly from metadata. The individual elements now snap with each other as interactive layout tool. The ‘add guides’ window can add multiple guides at once depending on the orientation and placement. The map frame itself doesn’t have to be rectangular, it can be of any size and shape. When you finish decorating your map, go to Share > Layout to export. The export formats remained same, except the compressed SVG (.svgz) and TGA is new, AI is gone (which you may not need when you already have .EPS). Most of the format lack some of their options compared with ArcGIS Desktop. All of them have a same option – ‘clip to graphics extent’, a familiar option which can be found in Adobe Illustrator. The default output name is surprisingly “ArcGIS.jpg” which should be “name_of_the_project.jpg”. I never understood why the DPI has to go below 100 because that creates a crappy output. Why not use a ‘quality’ slider saying ‘best’ to ‘smallest’ and adjust the DPI with the screen resolution just like Adobe Illustrator do. Conclusion Maybe I am not the right person to judge an application like ArcGIS Pro from a GIS powerhouse like ESRI who has been feasting on its lions share of the overall geospatial market for decades. But let me pick few things as I walk through with this new software and have them listed before it jeopardize my head. Good things The first good thing about this new software is that it is not ArcGIS desktop. ArcGIS Desktop somehow messed up in so many level that we should give up hoping for more fix ArcGIS Pro is finally a cutting edge technology that works with both 2D and 3D. It takes advantage of latest multi-threaded processors and RAMs. It can also work with advanced GPUs to accelerate its 3D rendering capability The project-based mapping workflow, the familiar ribbon-based user interface, the task and templates will help users of many other field to understand and communicate with each other Eliminating a lot of edit-time and layout-time complexities shows that ESRI really hears what their customers use to say. For example, autocomplete polygon option now doesn’t depend on the double-click from the user to finish, it has its own finish button. This helps people with tablets a lot. There are a lot of similar complications been taken care of; so does many unnecessary options, exotic styles and commands with self-conflicting behavior. I really liked the Python scripting environment. The geoprocessing windows took care of all the floating toolbars. The raster processing has found some new functionality. The users have more control over the user interface, geoprocessing capabilities and the project workflows. Bad things The user interface is fascinatingly dull! I would expect a darker interface for the people who work longer in front of the computer. (For example, Microsoft, the inventor of the ribbon interface themselves are switching to darker interface because they just look really good) Still more to do to resolve conflicts among multiple Python environments under same workstation. Even if Python in ‘sandboxed’ inside the application (bin folder), user should get access to it and install libraries they want. The biggest advertisement of ArcGIS Pro seem to be its ability of using its Large Address Aware processing engine. But in reality there are very little option to take advantage of this capability. For example, the geoprocessing tools can use more than 4 gigabyte memory, but no one sees how they are doing this. Are they taking single channel or multiple. How about running multiple tools in parallel. The worst thing is actually the essential part of the application – the layout making functionality. The tool and options for layout making, map frame, adding symbols, elements and exporting to the final output seem to have spread across several panes. The steps for the final output gained complexity and sometime sluggish behavior. The verdict No wonder ArcGIS Pro is built on experience from a range of products which has been successful for a many good year, but the application itself is still a new born. Even if the product looks promising but it still feels underdeveloped and sometime unfinished. I understand the excitement, but let me suggest to hold your patience for a few more year. The ArcGIS Pro is good, but it can be better. There must be a balance between the functionalities and the demands. ESRI has taken a bold move, let them finish their journey. ------------------------------------------------------------------------------------------------------------------------------------------ Also published here in ClubGIS.net
  17. 1 point
    I know by experience when i was visiting a project site in Western africa , if you see a black dude with an AK-47 near an alluvial areas, then that is where the Diamonds are. i hope that helps.
  18. 1 point
    Hi Paolo, Remember from my text: "collect around 200 l of alluvial, concentrate by panning, then carefully observe the heavy minerals associations". I saw some papers telling about 100 kg (the minimal I think). We were more conservative and prudent in some projects. It is a large quantity; depending on on the pan size, at least 10- 20 pans to wash. Finally, depending on the area, you will obtain some hundreds of grams of heavy minerals; among them, a lot without significance, like magnetite. And then, in less quantities: pyrope and eclogitic garnet, chrome diopside, picroilmenite, chromite; and, to a lesser extent, olivine . The indicators. These are the indicators about a kimberlite body. The kimberlite is decomposing fast and will leave this mineral traces in the alluvial, but diluted with other minerals, depending on the distance. It is what you are searching. Personal (from some sustained field experience, and also a lot of study for Remote Sensing or GIS) I don't think that you can discriminate those minerals, in such small quantities, basis on remote sensing, in alluvials. To few, in order to have a significant spectral signature. See an article, about the kimberlites* As a good help, starting from the satellite data, you can do a geomorphological analysis. Discriminate well and precise the hydrographic network, then to locate some favorable areas (terraces, dejection cones), for heavy minerals concentration. Among them, beside the indicators, you can find, or not, diamonds (3.52 SG). It is what I done, in my projects. Not Angola, but nearby. Then, to start exploring, as I wrote before, on the ground. Or direct mining, with the risks of acquiring heavy equipment and be without enough reserves. I don't know if you have an exclusive license; if yes, can you send me the coordinates, in order to see what it is available (satellite) for that area ? If you are prospecting, and the area is confidentially, please send something like an nearby area, one-two hundreds kilometers distance. They are some new satellite data and I want to see the confidence, if you are agreed. Regards, Iulian * http://www.hgimaging.com/PDF/Kruse_IEEE2000_Kimberlites.pdf "Higher spatial resolution data (1.6m AVIRIS and 4m HyMap acquired in 1998 and 1999, respectively) are being used to map additional detail. Poor exposures, vegetation cover, and weathering, however, make identification of characteristic kimberlite minerals difficult except where exposed by mining. "
  19. 1 point
    It does really work. You probably missed one step or two during the process. One method you can do to check whether the file is NT or non-NT is by using GPSMapEdit, because it won't open NT format otherwise it will. Here I show you the snapshot when I try to open an NT format file in GPSMapEdit. Here is the same file with a non-NT format. OK, since I cannot edit my previous post, I am going to re-explain the procedures here. I enclose some snapshots for the clarity. Open the GMAP Tool Add the NT formatted img file/s (in my case, filename is 62320070.img) Go to Split tab and create subfiles. Click Split All. Download Garmin-GMP-extractor.exe tool and then put it in the same folder with your working files. Drag the GMP file into the Garmin GMP extractor tools. It will explod/extract the GMP fiel into five type of subfiles (.LBL, .NET, .NOD, .RGN and .TRE) Back to GMAPTool. Add those subfiles. Go to Join tab. Name the output file and directory. We can give mapset name. And the click Join all. FINALLY, the result is another img file with non-NT format. If you watch closely there is a slight difference of filesize between both files.
  20. 1 point
    This is a very very broad question. It really depends on what you will be using it for. When starting out I start out with only 2 major questions: 1) What functionality do I need? Less is more. Too many web mapping apps are loaded with almost too much functionality. It's a challenge making something that is robust functionally and intuitive to use at the same time. Many of the templates you will use will only have 50% of what you will actually need and the other 50% will be things you don't need/want. This includes security. This also includes determining whether or not users will connect through a mobile device to your app as well as a PC (this changes a lot of things). Things like User vs. Administrator functionality need to be considered, target audience, large-scale multi-user editing requiring enterprise dbms, etc... Open source vs. properietary? 2) What back-end will I use to store and manage the data and what front-end will you use to deliver the data (i.e. Silverlight, HTML5, etc...) They each have their advantages and disadvantages and is usually determined by the functionality I need. There are still reasons to use Silverlight in some rare cases. They are tools to do the job, just like a hammer or wrench. I've seen some terrific Silverlight webGIS (our main company editor is still utilizing Silverlight due to the fact it can still do somethings our staff rely on, that something like HTML5 cannot). On the reverse, I've seen some terrible HTML5 webGIS applications as well. Although I do strongly urge most people to stay away from Silverlight due to the obvious fact that its not supported by a lot of new browsers as well as UI issues it tends to have. There are no real "best practices" for what to put on a user's site because it's dependent directly on what the user will be doing with it. For example at our office, we like everything minimalist and this means no scale bars, scale text, etc... on the map (these only show up if the user wants them to from the toolbar or in a print layout). Our staff want maximum imagery and no "filler". We use regional and local projections (i.e. MTM or UTM zones) and not generic Mercator projections as we need good measurements with little distortion. We do NOT like to use cloud storage (this is different obviously for other businesses). We put lots of effort into creating good printing templates for reports (this is something that is really really neglected I find on web GIS apps). I mean I guess you could say north arrow, scalebar, print, export, legend etc... but those aren't really best practices that are related to WebGIS as they apply to all cartographic products. Things like heat maps, cluster mapping etc are often used incorrectly. In order to use this type of mapping you really need a nice amount of representative data. Having a heat map generated from say 20 points over a large national area is relatively useless. I don't recommend these things unless your data is good enough to support it. Web GIS applications are often created with what looks like the intended purpose of fully replacing a desktop environment and I strongly think this is a recipe for disaster because its impossible to do that. I see a lot of Geocortex solutions do this and a lot of it is just screen "bloatware" (its a great product in the right circumstances though). Consider these adjectives: - intuitive - responsive - quick - easy - simple - comprehensible - stream-lined If your application can meet most of these, then you are on your way. Of course, the application is only 1/2 of the package. The data is the other 1/2. If the data isn't properly prepped, etc for use on the web or in your application then your awesome application will run slower as it struggles with the loading of the data. When you say it is for commercial use, do you mean you will be using it to sell products on it commercially (i.e. such as an air photo library), or do you mean it will be used by "Company X" as a generic viewer for their staff at work?
  21. 1 point
    I have 2 questions for Lurker: 1) do you need a special permission, a legal document to fly a drone in your country ? For example in USA, drone operators need to register (and to pay a fee) to Federal Aeronautical Agency, and similar situation is in some west European countryes ? How is in Indonesia ? 2) do you use Ground Control Points (GCP's) marked on the the land surface with the GPS when you fly your drone, to produce accurate orthophoto mosaics ? Thank you. Arhanghelul
  22. 1 point
  23. 1 point
    just adding some information, when you want to build a UAV you need to know what your purpose, whether you need a copter or fixed wing, both have advantages and disadvantages I give you example from our project copter, easy to navigate, easy to control, suitable for small area, relative detail since copter can fly in low altitude. travel only in short distance compare to fixed wing fixed wing, suitable for large area, can fly in tenth of kilometers, hard to control especially at landing, cannot fly in low altitude,
  24. 1 point
    Hi sukh_rehal_86, Two books can be a good starting point for you.. One from our friend, msig0000: And a second one over here: Hope that help. Happy Learning! darksabersan.
  25. 1 point
    You cannot compare two software bluntly. ERDAS Imagine has it's own user group in commercial resource management and exploration sector. ENVI also has it's loyal customers in universities and private research groups. The reason ERDAS is so popular in Asia and other places because they have a very good marketing department set in these places. The reason why ENVI can't get out of the wish list is most of the American and EU graduates can't give up using IDL for so many engineering and technical studies. IDL is awfully interesting for geeks, sometime as powerful as Matlab. ITT corp has their money flow steady by its global network of big scale industries, ie. aerospace, transportation, defense, energy and industrial markets. Now ITT is one of 100 top contractor in USA. Intergraph corp is more focused in engineering and geospatial solution since it's beginning (may be that's why they are good at selling their products). ERDAS Imagine, being an adopted son for so many parents over time (starting from the universities of America and Canada) ended up with Intergraph after touching many big names in its path. During its journey the software inherits codes and ideas from many experts, started its algorithms written in Fortran and later rewritten to C, sometimes Python. Being closely tied with a robust Fortran-derived interactive language, ENVI is a cross-platform image processing monster hugely popular among academicians, engineers, geospatial analysts, modelers and programmers. If you are a novice image analyst, ENVI is your thing. If you are a power user, application builder, environmental model maker/ tester, medical scientist, even a rocket scientist you will find ENVI sitting in you pc. But remember, great power comes with great responsibilities. If you are a white-collar GIS analyst, ERDAS Imagine is your thing. This software has it's charm in doing small things quickly and in a stereotyped way. In Imagine, things are easy once you learn the names of the buttons. Every function has only one wizard so learning curve is flatter. If you are a hobbyist, professional with little or no geospatial background, lousy professor then Imagine is your tool. Consider taking a peek to the other big names attached (ie. GeoMedia) to know how Intergraph deals the 'other-part' of geospatial industry. As you can see, every one has their own vice and virtues. Choose wisely.

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