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I have also had a lot of success using the image classification tools in ArcGIS (http://resources.arcgis.com/en/help/main/10.2/index.html#//00nv00000008000000). The documentation is great and the results have been very accurate. Unsupervised classification is tricky because defining the number of classes will always result in some degree of mixing. Even ...


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The GeoTiff format is a good format for interchange with ArcGis, it is one of few that: Supports more than 3 bands. Has a wide range of pixel types (from 1 bit to 32bit signed/unsigned/float). Has multiple compression options (from none to JPEG/Lossy). Read more about supported raster formats from the Esri docs. It is a good idea to verify the spatial ...


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If you use QGIS, there is a plugin named "semi automatic classification". It may not take too much time to utilize the plugin because you might be familiar with the RS analysis methods. I have used it for 1 week and have been pleased. The plugin is also capable of downloading landsat's photos. Here's the link of classification tutorial. ...


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Add a new field called "class" of type string to your attribute table. Right-click on the "class" column header and choose "Field Calculator." Check "Python" instead of "VB Script," and check "Show code block." (I'm going to assume your gdp field is called "gdp", and your tweet-percent field is called "percent".) Enter this code in the code block: gdptag = ...


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You can/must convert your .shp file to ROI in ENVI. Go to vector > convert vector to ROI and select your shapefiles. Check this video for converting to ROI https://www.youtube.com/watch?v=ukrgGUkxJlU from 7:20



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