GIS and Remote Sensing Tools, Tips and more ..

NASA and the U.S. Geological Survey (USGS) have started work on Landsat 9, planned to launch in 2023, which will extend the Earth-observing program’s record of land images to half a century.  The year 2023 seems like a long way off, however.   The Landsat program has provided accurate measurements of Earth’s land cover since 1972. With data from Landsat satellites, ecologists have tracked deforestation in South America, water managers have monitored irrigation of farmland in the American West, and researchers have watched the growth of cities worldwide. With the help of the program’s open archive, firefighters have assessed the severity of wildfires and scientists have mapped the retreat of mountain glaciers. The President’s fiscal year 2016 budget calls for initiation of a Landsat 9 spacecraft as an upgraded rebuild of Landsat 8, as well as development of a low-cost thermal infrared (TIR) free-flying satellite for launch in 2019 to reduce the risk of a data gap in this i...

There are two ways to remove twitter headers and footer from the widget: Method 1: Add data-chrome attribute to anchor tag <a class="twitter-timeline" href="https://twitter.com/TWITTER_ID" data-widget-id="YOUR_WIDGET_ID" data-chrome="nofooter noborders transparent" >Tweets by @TWITTER_ID </a> Method 2: Using CSS .timeline-header, .timeline-footer {           display:none ; } More customization on Embedded timelines :  Customization Options

The annual FOSS4G conference is the largest global gathering focused on open source geospatial solution. FOSS4G brings together developers, users, decision-makers and businessmen from a broad spectrum of organizations and fields of operation. Through six days of workshops, presentations, discussions and code sprint, FOSS4G participants create effective and relevant geospatial products, standards, human networks and business opportunities. FOSS4G Seoul team is very pleased to announce that FOSS4G Seoul conference is now open for registration.  http://2015.foss4g.org/attending/registration/    This year’s International FOSS4G will be held in The-K Hotel, Seoul, 14-19 September, for the first time in Asia.   

A R update method proposed by Dr. Jeffrey S. Evans, University of Wyoming. Here is the method background and details: Updating R to a new version can be difficult so, I thought that R users out there would find these R version management and configuration approaches useful. There is an R package “installr” that allows one, at the command line, to check the current R version and optionally: 1) download the new version, 2) launch the install, 3) move installed libraries to the new R install, 4) update libraries and 5) uninstall the previous R version. I also attached an “Rprofile.site” R GUI configuration file that will set the path for the R library and changes some other settings. Following is the code that will install and require the “installr” package and run the “updateR” function with the appropriate flags. To run in Windows, right click the R icon and select "Run as administrator". This script will automatically: 1) check and download the current version of R, ...

Following are the band combinations for highlighting earth features for Landsat Images.      Agriculture : Highlights agriculture in bright green. Bands 6,5,2   Natural Color : Sharpened with 25m panchromatic band. Bands 4,3,2+8   Color Infrared : Healthy vegetation is bright red. Bands 5,4,3   SWIR (Short Wave Infrared) : Highlights rock formations. Bands 7,6,4   Geology: Highlights geologic features. Bands 7,4,2   Bathymetric : Highlights underwater features. Bands 4,3,1   Panchromatic : Panchromatic image at 15m. Band 8   Vegetation Index: Normalized Difference Vegetation Index (NDVI). (Band5-Band4)/(Band5+Band4)   Moisture Index: Normalized Difference Moisture Index (NDMI). (Band5-Band6)/(Band5+Band6) Further Details:  Identifying land use and land cover(LULC) features using band rationing technique

Draw features in ArcMap using ArcGIS Addin tool (Arcobject's IRubberband Interface)  doesn't provide ways to zoom and pan while editing. In order to implement pan and zoom functionality during edit use  IDisplayFeedback Interface . Following is  the code snippets using IDisplayFeedback Interface using C#. Then, you can use ArcMap standard keys to pan (arrows-left, right, top, bottom) and zoom (mouse-scroll or Z & X). protected override void OnUpdate() { Enabled = ArcMap.Application != null; } protected override void OnMouseDown(ESRI.ArcGIS.Desktop.AddIns.Tool.MouseEventArgs arg) { DrawGeometryOnMousedown(ArcMap.Document, arg); } protected override void OnMouseMove(MouseEventArgs arg) { DrawGeometryOnMouseMove(ArcMap.Document, arg); } protected override void OnDoubleClick() { FinishGeometryDrawOnDblClick(ArcMap.Document); } protected override...

protected override void OnMouseDown(ESRI.ArcGIS.Desktop.AddIns.Tool.MouseEventArgs arg) { //create geometery if (ArcMap.Document != null) { IScreenDisplay screenDisplay = ArcMap.Document.ActiveView.ScreenDisplay; // Constants screenDisplay.StartDrawing(screenDisplay.hDC, (System.Int16)esriScreenCache.esriNoScreenCache); // Explicit Cast IRgbColor rgbColor = new RgbColorClass(); rgbColor.Red = 255; rgbColor.Transparency = 75; IColor color = rgbColor; // Implicit Cast ISimpleFillSymbol simpleFillSymbol = new SimpleFillSymbolClass(); simpleFillSymbol.Color = color; //Draw geometry ISymbol symbol = simpleFillSymbol as ISymbol; // Dynamic Cast IRubberBand rubberBand = new RubberPolygonClass(); IGeometry geometry = rubberBand.TrackNew(screenDisplay, symbol); //check for va...