This is a subset of an image we processed using ERDAS Imagine. First we had to learn a bit about how to use this new program, which seems to have a huge range of capabilities. After loading a raster image into the Viewer and making sure the display was set to Pseudo Color, we spent some time learning how to navigate around the image and comparing one image at a lower level of detail (AVHRR) with one a LANDSAT Thematic Mapper satellite image. The first was classified, while the second was continuous - raw data from the sensor. We set the preferences to enable Fit to Frame and Background Transparent, making sure the Clear Display option was off, and experimented with options in the Multispectral tab to see what combination of Bands enhanced which types of features, such as vegetation, rivers, urban areas, etc. The third part of this lab was the creation of a map which we began in ERDAS Imagine, where we created an attribute to show the area of each class in the image, and then exported a subset of the map to make a map in ArcMap. This was done using the Inquire Box and then creating a subset image. In ArcMap we made Class_Name the value field, with Unique Values chosen so that the hectares for each class would be listed. I chose to edit the description so that the information would remain with the data rather than being temporary.
Clearly the ERDAS Imagine program is very useful and has huge capabilities, but is limited by a few bugs which is unfortunate.
No comments:
Post a Comment