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  1. Hello members of GIS AREA ! Drones, also named UAV's or UAS's, are becoming increasingly popular for different applications. Me, I am interested in the field on drones applications for remote sensing, more exactly for aerial mapping, to produce orthophotos, Digital Terrain Models (DEM) and other products which are very useful for research or private businesses. I would like to know more about how to build a personal drone from 0, how to selected the best platform for the application of aerial mapping, how to fly the drone and how to process the datasets obtained from drones. I know th
  2. This is a very interesting writing by Ned Horning, Center for Biodiversity and Conservation at the American Museum of Natural History. Take a look, *************************************************************************************************************************************** There is no doubt that satellite remote sensing has greatly improved our ability to conduct land cover mapping. There are limitations, however, and these are often understated or overlooked in the professional literature. The following statements are based on some common misconceptions related to using remote
  3. Hi all, I'd like to share a tool I created to automate the calculation of spectral indices for remotely sensed imagery. Currently, 22 spectral indices and the following sensors are supported: Landsat 1-5 MSS Landsat 4-5 TM Landsat 7 ETM+ Landsat 8 OLI Worldview-02 MODIS Terra and Aqua Just run the Python script (arcpy or GDAL) and use the GUI interface to select your sensor, indices to calculate, stacked image, and output directory. I haven't shared the tool yet and thus it has not been extensively tested. My personal tests have worked fine, but be sure to validate y
  4. Dear All I want to use supervised image classification method in ENVI 5.3 and I want to link image in ENVI with google earth for accurate training data selection. I can't find this in ENVI. In Erdas Imagine this is really easy to link image with GE but in ENVI i can't find!
  5. Hi All, I am a Doctorate in Remote Sensing and GIS. I have created an online tutorial Geospatial Technologies primarily concentrating on practical aspects both for beginners and for advanced learners. I am sure this will be useful for the members. Please have a look at the following link. https://www.youtube.com/channel/UCK-8Ky7ZiohkOrHpe6EM1Lw Tutorials are totally free of cost and created just out of passion to help students and professionals in the field of Geospatial Technologies.
  6. Dear all I'm new in remote sensing and I have problems when try to extract built-up area from an image or during image classification. I am using landsat 7 ETM+ and TM images, when I use supervised or un-supervised methods for image classification, urban area (built-up area) are not recognizable from bare-soil. I read several papers about built-up Indexes and tried some of them but there is no tangible improvement in results. Please guide me as step by step process. Regards
  7. Hello, im having a hard time to find the difference between unmixing methods, and radiative transfer models. are they both used in canopy retrieval biophysical parameters ? are they both used in airborne image ?
  8. Hi all, does anyone knows a software (or alternatively an internet site) where you can search on multiple commercial satellite imagery catalogs? for example if i need a sat image of an area, for a particular date, how can i search in Airbus, DigitalGlobe, Deimos, Kari, and other commercial imagery providers in just one step? thanks
  9. Hello, I'm currently working with the MODIS product MOD13Q1 (Vegetation Indices 16-Day L3 Global 250m) and I ran into some difficulties with the interpretation of the quality assessment information. I already posted my question on stackexchange ( http://gis.stackexchange.com/questions/171792/how-to-correctly-parse-modis-qa-layers ), but got no answers. Maybe anybody here has an idea? If I receive an answer here, I will update the question on stackexchange (and vice-versa). Here's the text of the question (identical to stackexchange): I'd like to correctly parse the MOD13Q1 VI
  10. Hello everyone, On behalf of the iEMSs Workshop A3 organisation team, I would like to bring your attention to the Workshop named "Long –Term Analysis of Socio-Ecosystems Under Climate Change: New Avenues for Integrated Modelling of Adaptation Processes". This workshop will take place at the 8th International Congress on Environmental Modelling and Software - iEMSs 2016 - in Toulouse, France, on July 10-14, 2016. Under the organisation of Prof. Carlo Giupponi and Dr. Paola Mercogliano, this workshop will focus on modelling and techniques (Remote Sensing - RS and Geographical Information S
  11. Hello friends, I think geospatial software (commercial and free), user cases, and problem solving issues related to people who uses mac as operative system, would worth having. I will list only a few of them (the ones I use or am interested in) to show that out there it might be a potential pool of users interested of what gisarea has to offer: tutorials, software, and solutions based on users' knowledge and experiences. Here is the gis/remote sensing list of software available for mac: qgis saga spatialite grass gis otb/monteverdi2 envi/idl tntmips postgresql/postgis cartographica Us
  12. Hi, guys. Guess what? Deadpool is here to be a superemotesensed hero. Okay, now, serious. My question may make you feel like want to stab me but I am now being serious. I am a remote sensing student, and now I am in my last year of my study. I wonder is there any remote sensing job for fresh graduates? Because everywhere I found almost nothing but GIS jobs. I like non photographic remote sensing so much, it is my passion. Anyway is there any chances in your countries to give a stranger foreigner fresh graduate a job? I am just wondering, because we are lowly paid in my country. Thank you
  13. HI my names is Djo and nowdays I'm interested to continue my Master Degree and find out a little bit confused about which college I want to go in I'm interested to learn about: 1. Making GIS as startup 2. Big Data analytic 3. Mobile and Web based GIS 4. Location Analytic and Spatial Analytic 5. Business Intellegence 6. GIS as Decision Support System and Modelling 7. and also GIS application for Urban, Property, Retail, and marketing I've searched with Google and find similar course that some college like this http://www.fh-kaernten.at/en/degree-programs/engineering-it/ove
  14. A 30x30 metre spatial resolution would be classed as a low resolution image? As when zooming in, it is hard to make out land covers easily, compared to a high resolution image where smaller land covers could be seen clearly such as roads, small streams and urban buildings.
  15. Hi, I am now trying to build a python based image processing simple application. However I found out that the perfect match library rsgislib is compatible in Unix like environment. I don't know how to use it like normal libraries in Windows environment. Is there any substitute library for rsgislib, or is there a way so that I could let it compatible with windows environment? rsgislib:http://www.rsgislib.org/ Sincerely,
  16. permisi salam kenal, saya dikky setiawan sedang membuat Tugas Akhir berkenaan dengan remote sensing Saya punya permasalah pada pembuatan peta tutupan lahan, dengan menggunakan software argis 10 dan erdas 8.5 1. saya sedang membuat peta perubahan tutupan lahan, antara tahun 1990, 2000, dan 2015 pertanyaanya, setelah saya calculate luas dalam bentuk luas (ha) kenapa setiap tahun total Luas nya berbeda pada kecamatan tersebut ? padahal saya sudah clip dengan benar, sebelum menghitung, contoh luas kecamatan 100 ha, setelah saya buat peta tutupan lahan, total nya tidak 1
  17. down votefavorite i have a problem whem i am working to calculate the ndvi from landsat sattellite of rainy season i have assumed the pixel value above 15000 are clouds and calculate NDVI.then i am assigning the clouds pixel in ndvi 1. The main question is how to calculate zonal min max value of ndvi and percentage of cloud and percentage of ndvi greater than 0.5 in a particular zone.(zone are the vilage boundary of District). please help to solve this problem in arc gis.
  18. We have all seen, downloaded and used Landsat satellite imageries. Landsat, starting from its journey on july 23, 1972 is the longest running enterprise for collecting satellite images of the earth. Researchers around the globe know Landsat for its vast pool of information zipped in an archive and free to download anytime from internet. In this post let me go through the contents inside a level 1 image archive when you download one. When we download an image archive from USGS or USGS Glovis website from level 1 section, we use to download small section of its image archive stretching 170 k
  19. Hi guys! I`m working on land cover change detection project of Kyiv province in Ukraine using Landsat data and ancillary information. I want to find change in Land Cover from 1990 to 2014 of Kyiv province using Decision Tree approach in ENVI. I have already done radiometric correction, atmospheric correction and apply cloud mask to whole Landsat`s scenes, and now I have question and request. Do I need to do mosaicking before classification or mosaicking classified image ? Does anybody have some decision rules for splitting pixels for appropriate land cover classes using Landsat
  20. A short pre proposal to NASA is needed. The topic issue is how to create a new Southeast Florida for 2014 using imagery available from the orbital satellites. NASA is most interested in obtaining accurate land cover classes that depict water surfaces, woody vegetation cover, urban areas, and grass-dominated areas. What classification algorithms would you use and why? How would you incorporate training and validation data and what standards would you use to decide if the land cover products are acceptable? What might the limitation be of the satellite-based approach you are proposing?
  21. Hello, I need to develop an Ontology for remote sensing domain, for object recognition in High resolution Satellite imagery. Has anybody worked on developing Ontologies?
  22. Grateful if anyone can advise whether the tasseled cap transformation coefficients for SPOT 6 image have been derived or not? If not, are there any alternative methods for studying the "Wetness" parameters of the vegetated study area? Many thanks for your help.
  23. Another great news for the remote sensing community: SPOT 7 was launched from India and is now on orbit ! http://www.spacenews.com/article/launch-report/41070india%E2%80%99s-pslv-rocket-lofts-airbus-spot-7-satellite This will be a great source of satellite images (but not for free )
  24. My greeting to everyone and I need help from the members of our family. My problem is that. how can I extract high albedo and low albedow surfaces from the LANDSAT data. I need theses surfaces to create the area of Impervious surfaces for different periods. I am looking forward to an step by step reply.
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