Estimate the total population of Heshun county in year 1998 according to the population data of 50 sample villages in the sampling investigation of Heshun county
Figure 1.Select the sampling steps
Defaults: “ New Sampling Design->Having sampling site data ”, set the file as follows:
“ Sampling Design File ” is the file that save the sampling design data, created and named by user, its postfix is.prj;
“Map of the region” is the vector map of the prepared sampling zone (it is the.shp file of ARCGIS);
“Sample Site Layer” is the gained data of the sampling sites (it is the.shp file of ARCGIS).
Step 2: Select the statistical features of the sample values
The selected sampling model is simple random sampling, select “value” in sample value features, In Figure 5, the two columns in the table ( SmID 、 SmUserID) are automatically created by Supermap, the first column is the internal order of the data record, the second column is the order that signify the record by user, which can be modified according to the requirement, CODE is the number of the administrative village, NAME is the name of the administrative village, “Value” is the population size of the administrative villages that are investigated by user, which need to be inputted by user.
Figure 2.Select the features of the sample values
Step 3: View the statistical results
Figure3. View the scatter plot (X-axis is the administrative village size, Y- axis is the actual population value of each administrative village in investigation)
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.