I need some help, because I've no clue how solve this issue the exercise that I'm trying to perform.
The point where I'm stuck is 4. "Create signature file as LandsatCompS.sgs". I've done what it says in the exercise. I got a error message "Failed to create signature file.
The aim of the exercise is to carry out a supervised image classification of the Northernhalf of Jutland.1. Start ArcMap and add the Landsat images from the B series (summer images).
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The point where I'm stuck is 4. "Create signature file as LandsatCompS.sgs". I've done what it says in the exercise. I got a error message "Failed to create signature file.
The aim of the exercise is to carry out a supervised image classification of the Northernhalf of Jutland.1. Start ArcMap and add the Landsat images from the B series (summer images).
- Create a composite image composite image for all bands except band 6 – the thermalband. Save the image as LandsatCompS (S for summer).
- Open the orthophotos for land (not urban). Add eventually more orthophotos from theGeodata library. Try to identify the necessary number of different land cover classes tocover all areas on the orthophotos. Not more than 15!
- Open the Image Classification window, and start digitising training areas. Two for eachclass. Create the signature file as LandsatCompS.gsg.
- Carry out maximum likelihood classification using LandsatCompS as input raster andLandsatCompS.gsg as signature file. Output is ML_class_NJ1. Use default values forthe other inputs.
- Put the right colours on the new map and compare with the orthophoto and other mapsavailable for Northern Jutland.
- Where are the problems? Try to make an improved classification by increase thenumber of classes and digitise new training areas. Carry out the classification andassess the result. Which one is best?
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