I am using three vector layers (point, polyline and polygon shapefiles) of the region of interest. Any advice in making the selections from one dataset based on the other datasets? What I am trying to do is to select the features of other two layers based on the one layer. I am aware that QGIS does provide a function for the selection of one vector layer based on the other layer but this is not the case because I am interested to select features of two vector layers rather than one.
Hi,
You can use ArcGIS for the same. If you want to select points which are falling in particular class of polygon you need to follow the steps.
1. Select the polygons based on the attribute using the function available under Selection Menu / Select by attribute.
This will select the desired polygons.
2. Then you need to use the Selection tab again to select the points which are falling in the selected polygons.
3. Go to the Selection / Select by Location. Here you have option to set. You need to tick the point layer under the tab Select feature from .... Then in the that: you can select the needed criteria to fulfill the requirement.
Hope this will give an idea for the same.
Good luck..
Vijith
If you need this as a repeating task, you can consider using QGis and writing a Python script.
Jacek: Thank you for your feedback. Yes, that may also be an option for the repeated task. Actually this is the case for me that I need to perform a repeated task for a large geographical area. Is there a possibility to use a model builder instead and then export the model as a Python script? Any advice/comment on this?
Well, I do not know anything about this. If you want we can talk about some kind of cooperation - I have experience in writing qgis plugins and a team. Mabe we can write a paper together?
@Jacek: I will be more than happy to work in collaboration with you and your team. We can work together and share our experiences. Answering my own question just to share the information, Model builder can export the algorithm in Python scripting as well.
@Jibran Khan, Glad to hear that. Please contact me via my email: jacek.rapinski uwm.edu.pl. Then we can discuss more.
use QGIS, add plugin spatial query, then select overlaying features based on OVERLAPPING /CONTAIN/ TOUCHES /CROSS/ WITHIN many options are there. you can select. it is free software QGIS. power full tool.
if your data size is big, use postGIS to store the data, and do above mentioned process or postgreSQL query, mor options may be there.
all the best
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