Re: [Qgis-user] FW: Using one vector layers to calculate the unemplyment rate in another vector layer
Sorry, you have to do it from the beginning as the area of The Census sub-place should be calculated as well. The 4th step is something like: area_of_intersection number_of_unemployed * area_of__The_Sensus_sub-place Afterwards: Vector / Data Management Tool / Join attributes by location. Remember to check "Take summary of intersecting features". K. Pretorius Deon - Lieutenant Colonel wrote: Hi 1. Thanks for the assistance. I have done that up until your 3de explanation point. 2. All the Sensus Sub Place data are now "cut" and within each policing district. Perhaps any assistance on how I can now get the averages of each of the Sub Place "numbers" per policing district. Regards Deon -Original Message- .. Just an idea: 1. Using the Field calculator add a new column with polygon areas for the police district layer. 2. Create the third layer as an intersection between the Sensus sub-place layer and the police district layer. 3. Using the Field calculator add a new column with polygon areas. Now you have a attribute table to calculate the statistics. .. Pretorius Deon - Lieutenant Colonel wrote: .. I have a vector layer that exist out of about 1000 polygons of the different police districts. Then I have a Sensus sub-place vector layer with over 10 000 sub-places which indicate the number of unemployed citizens per polygon. The Sensus sub-place layer therefor overlaps with the police districts and when visualize some sub-places can make up 1% up to 100% of a given police district. Most of the police districts also contains 4 or more sub-places. The problem is I want to calculate the "approximate" unemployment rate per police district by using the data from the Sensus sub-place layer. Is there perhaps an explanation on how I can determine" approximately proportionally" what the unemployment is per police district. I am new to QGIS and not up to date with programming, however any assistance would be appreciated. .. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] FW: Using one vector layers to calculate the unemplyment rate in another vector layer
Hi, Just an idea: 1. Using the Field calculator add a new column with polygon areas for the police district layer. 2. Create the third layer as an intersection between the Sensus sub-place layer and the police district layer. 3. Using the Field calculator add a new column with polygon areas. Now you have a attribute table to calculate the statistics. Best regards, Karlis Pretorius Deon - Lieutenant Colonel wrote: .. I have a vector layer that exist out of about 1000 polygons of the different police districts. Then I have a Sensus sub-place vector layer with over 10 000 sub-places which indicate the number of unemployed citizens per polygon. The Sensus sub-place layer therefor overlaps with the police districts and when visualize some sub-places can make up 1% up to 100% of a given police district. Most of the police districts also contains 4 or more sub-places. The problem is I want to calculate the ”approximate” unemployment rate per police district by using the data from the Sensus sub-place layer. Is there perhaps an explanation on how I can determine” approximately proportionally” what the unemployment is per police district. I am new to QGIS and not up to date with programming, however any assistance would be appreciated. .. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] FW: Using one vector layers to calculate the unemplyment rate in another vector layer
Hi Everybody, I have a vector layer that exist out of about 1000 polygons of the different police districts. Then I have a Sensus sub-place vector layer with over 10 000 sub-places which indicate the number of unemployed citizens per polygon. The Sensus sub-place layer therefor overlaps with the police districts and when visualize some sub-places can make up 1% up to 100% of a given police district. Most of the police districts also contains 4 or more sub-places. The problem is I want to calculate the "approximate" unemployment rate per police district by using the data from the Sensus sub-place layer. Is there perhaps an explanation on how I can determine" approximately proportionally" what the unemployment is per police district. I am new to QGIS and not up to date with programming, however any assistance would be appreciated. Regards Deon Pretorius ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
