Spatial stratified model -- sample with layout
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（Vector）
 
Step 1: specify the file name and the location of storage

  1. Double-click SSSampling. Pop-up below interface:
  2. Select "Having Sampling Data "
  3. Under "Sample Design": Click on, choose a suitable file path to save the project files, such as: “sampling project”
  4. Under "Map of The Region": Click on , c hoose the hs_town.shp file
  5. Under "Sample Site Layer": Click , choose the sample site file.
  6. Click “Finish”.
Figure 1. Starting interface
 
Step 2: Choose model
 
  1. Choose "Sandwich sampling model"
    There are three ways to set up stratification, but only one can be used at a time.
    i. Open stratification: open the selected the stratification, then click to open the stratification file, pop-up dialog box. The selected stratification file must be the object of the regional set. The stratified region must coincide with the map of region interest, then select stratification feature that is, identification of the different stratification features.
    ii. Expert drawing stratification: first to create a new file to save the expert drawing stratification. Then click start drawing, the software will return to the map of region interest, experts draw the broken line to divide the map of region interest into a number of sub-regions. The each of sub-region is a stratum.
    iii. Calculating stratification information: select stratification information, open assisted variable information file. According to certain features of the stratification file, the features in the table will be added to the right of the window, enter the number of layers before stratifying( The default is 3), click the calculation of stratification to obtain the result of stratification.
    Click on "Preview Stratified Plot", we can see the result of stratification.
  2. Select "Value Features "
  3. Select "Layer Features," generally is LayerID
  4. Select "Scale" in the types of sample value(If the samples value feature is the proportion, that is, maximum value less than 1, minimum value greater than 0, select the proportion of value)
  5. Select "Sampling Ratio" (random, half of choice about 10%)
  6. Filled out a confidence level 0.95
  7. Click "Next"
Figure 2. Spatial stratified model ( sample with layout )
 
Step 3 ：Statistical inference results
 
  1. Pop-up under dialog :
Figure 3. Computation results of spatial stratified sampling model
  1. Complete the calculation

     
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