Step 1: Prepare the raster data of the sampling zone, then enter the spatial sampling interface:

Select: “ New Sampling Design-> Having sampling site data".
“ Sampling Design ” is the file that save the sampling design data, created and named by user, its postfix is.prj;
“Map of the region” is the RS image of the prepared sampling zone (it is .img format);
“Sample Site Layer” is the gained site data (it is the.shp file of ARCGIS).

Step 2: Select the statistical features of the sample values

The selected sampling model is stratified sampling， sample value feature is “Value”, select the corresponding layer file (the existed file that the layer are taken of the map of the region).

User can preview the stratified Plot, in the figure, the color amount is the layer size, which is relevant to the imported layer file, from the LayerID feature of the figure 4, we can see that there are 5 layers.

Figure3. Preview the s tratified plot

Sample value feature is “value”, sampling ratio is “0.0032%”, In Figure 4, Bvalue1 Bvalue2 Bvalue3 are the different waves of the image, the value is the grey level of this sample site in these waves, “Value” is the forest area of the sample, LayerID is the layer number.

Figur4.Select the features of the sample values

Step 3: View the statistical results

The statistical results of sample features are on the left, the scatter plot of sample value is on the right.

(Because the sampling sites are generated randomly each time, and the change of each sample site is larger, the screenshots results and the calculation results may be not complete agreement)

Note: Before creating the new project file or importing the existed one, user need to close the opened project file.