What envi-ERDAS has gained today

1. The following dialog box is always displayed in ERDAS because the format is changed to IMG after the ENVI geometric correction is performed on the modems' data:

Use the default proj: UTM, zone 48 North Datum: North America 1927, after the projection is converted to IMG, the above dialog box will pop up in ERDAS, but the projection can be changed in ERDAS. Therefore, it is preliminarily concluded that it is because proj: UTM, zone 48 North Datum: North America 1927 this projection is not recognized in ERDAS. In addition, if you convert the ENVI format to the ERDAS format and use ENVI to save the method as erdas img, use the import module of ERDAS for conversion.

2. divide two images in the model of ERDAS and find that the data value of the running result appears #####. ### under the guidance of others, it turns out that in the Division, the denominator has 0 values, and the trigonometric functions in ERDAS are calculated in radians. If the degree is to be converted to radians.

3. Mask in ENVI. You can use the basic tools -- resize data (spectrue/spatial) command to perform latitude and longitude, coordinates, and files (the file is the area where the mask is needed, make mask) is used before. Or use basic tools-mask, first open the image to create a mask, create a mask, select a range based on your preferred region, and then apply the mask.

Mask in ERDAS: it is best to mask the image in a single band. After the mask is used, the result of the mask output is the same as that of the mirror and mask, in this way, if you need to re-sample the same resolution as the mask image, you do not need to re-sample this step.

In ENVI, you can directly perform re-sampling. In basic tools -- resize data (spectral/spatial), select an image, open it, and click OK. In the displayed rsize data parameters dialog box, the set output dims by pixel size column is found. Click it and enter the pixel size to be output.

For details about how to perform re-sampling in ERDAS, see ERDAS -- interpreter -- utilities -- degrade, but it is a multiple. If it doesn't multiply, it won't work (for example, it was 1000, output 32 Resolution ).