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Sources for JOGS (Joint Operations Graphics) Online 1:250,000 NGA Topographic
By FreeWorldMaps,
Dear All,
About a year ago the US Government started quietly releasing scanned JOGS (Joint Operations Graphics) 1:250,000 NGA Topographic maps online and some other higher scale topographic maps in GeoPDF format. The links to download can be reached as follows:
http://store.usgs.gov
then go to "Maps >>"
then go to "National Geospatial-Intelligence Agency Foreign Maps"
An additional important separate archive for the JOGS is at the University of Texas
http://www.lib.ut
ArcGIS for Home Use Program
By Lurker,
Hello, wanna get Arcgis software for cheap price :grin:
ESRI launch program called "ArcGIS for Home Use Program"
only 100 dollar/year, you will get :
ArcView
ArcGIS 3D Analyst
ArcGIS Geostatistical Analyst
ArcGIS Network Analyst
ArcGIS Publisher
ArcGIS Schematics
ArcGIS Spatial Analyst
ArcGIS Tracking Analyst
what do you think ?
complete story here :
[hide]
http://www.esri.com/arcgis-for-home/
[/hide]
:laugh: :laugh: :laugh: :laugh:
Landsat 7 ETM satellite viewing angle
Global Mapper 13 Announced
By Lurker,
hi guys, just take a look in new major version of global mapper, 13,
Complete changelog can be seen here :
[hide]
http://www.globalmapperforum.com/global-mapper-13.html
[/hide]
and remember, this still on BETA stages, so bug and instability maybe occured :azn:
Extract elevation data from google Earth
By xsaladdaysx,
Hi all,
when we point the location using google earth then we will get the coordinates and elevation information, but Is it possible we do to extract the elevation data?
Warm regards,
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Hello folks! I am trying to use the Lyzenga Algorithm for estimating the depth of water in shallower areas, probably depths under 8-10 meters of lakes. First of all, how accurate is this algorithm in practice? Secondly, lets say i have the band values. can someone explain me how to retrieve those depths? I am following the "Lyzenga Algorithm for Shallow Water Mapping Using Multispectral Sentinel-2 Imageries in Gili Noko Waters" paper, but there are 3 steps of getting NDWIs, NDCIs and after filtering the Sun Glint Correction, then it finally comes to the depth calculating. it end ups in a formula of following: 𝑧 = 28.32 ∗ 𝑋1 − 36.25 ∗ 𝑋2 + 9.42 ∗ 𝑋3 + 16.35 x1 , x2, x3 are RGB values respectively. What do you guys think? can i just apply this formula ? if not, what is the purpose of all the previous steps, and will they change the rgb values anyways? -
Hello folks! I am trying to use the Lyzenga Algorithm for estimating the depth of water in shallower areas, probably depths under 8-10 meters of lakes. First of all, how accurate is this algorithm in practice? Secondly, lets say i have the band values. can someone explain me how to retrieve those depths? I am following the "Lyzenga Algorithm for Shallow Water Mapping Using Multispectral Sentinel-2 Imageries in Gili Noko Waters" paper, but there are 3 steps of getting NDWIs, NDCIs and after filtering the Sun Glint Correction, then it finally comes to the depth calculating. it end ups in a formula of following: 𝑧 = 28.32 ∗ 𝑋1 − 36.25 ∗ 𝑋2 + 9.42 ∗ 𝑋3 + 16.35 x1 , x2, x3 are RGB values respectively. What do you guys think? can i just apply this formula ? if not, what is the purpose of all the previous steps, and will they change the rgb values anyways?
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