Spatial Selection

Select by Location in ArcGIS

In ArcGIS we can use Spatial selection to select features which are related to another layer, as a example in the province layer what are the cities effect by the highway road,  try following example,

Step 1,

Add city or province layer you want to select,

Step 2, 

Add another layer you need to intercept, (here I'm using a road layer)

Step 3,

Then in the tool bar select "Selection" tool, and select "Select by Location", 

Step 4,

Then in "Selection Method" select "Select Features From" option, then in the "Target Layer(s)" you have to select layer you need to get the out put, for this example I have selected "Anuradhapura_gnd", then for the "Source Layer" you have to select next layer using for this operation, 

Step 5, 

finally in the "Spatial Selection Method" we have to select " Target Layer(s) features Intersect the Source Layers features" (normally it is the first option to be select) then "apply" and "ok"

Step 6, 

You can see now it has been selected intersect features,  

Step 7,

If you open the attribute table you can check the selected data, 

Step 8,
If you need to export selected data as a shape file you can follow below steps,

Thematic Mapping / Symbology

                                                   

                                     Thematic Mapping

In previous post we have given different colors to the different polygons, here we are doing something like same but here we are doing  analytic process, so this maps can be use for analytic tasks, 

Step 1 , 

  

Just add a your shape file in to layer

Step 2,

Then "right click" on the layer and go to properties then select "Symbology" tab.

Step 3,

Then select "Graduated Colors" under "Quantities".

Step 4, 

After that from "Value" select field you need, I have select "Male" filed for this task.

Step 5,

from "Classification" we can select how many breaks we need (number of range), 

Step 6, 

Then from the "Color Ramp" select color range you required. 

Step 7,

Then you can see the result by just click on "Apply" and "ok". Left hand side you can see the ranges and the colors as we given.