Good day
I'm new to GIS and I'm busy doing some work in ArcGIS Desktop but I've hit a wall. I have to find a new land fill site for the town that I live in. I have to select the landfill site according to specific criteria. The site must:
- be within 10 km from the center of town.
- be within 1 km from major roads.
- not be within urban ares or permanently cultivated areas.
- be at least 15 ha in size, but larger is better.
- Not be within 500 m of a dam.
- not be within conservation areas
- not be near rivers especially on steep slopes (see table 1)
Table 1: Distance from rivers specifications
| Slope | Min Distance (m) from Non Perennial Rivers
| Min Distance (m) from perennial rivers |
|---|
| <=10 | 100 | 300 |
| >10 | 200 | 600 |
| | |
These are the data sets that I have available.
File name
| Description | Format |
|---|
| Landcover | Landcover | Shape |
| Landsat | Landsat image of study area | IMG |
| DEM | A DEM of the study area | GRID |
| Roads | All roads digitized form 1:50 000 topo map | Shape |
| Rivers | All rivers digitized form 1:50 000 topo map | Shape |
| Rivers_area | All rivers digitized form 1:50 000 topo map | Shape |
| Dams | All dams digitized form 1:50 000 topo map | Shape |
| Ca_loc | All local reserves areas digitized form 1:50 000 topo map | Shape |
| Ca_cnc | All nature reserves digitized form 1:50 000 topo map | Shape |
So this is what I've done already:
- I've given all the data sets the same projection;
- I've buffered the 10 km
- I've buffered the 1 km
- I've selected all non - urban areas and non-permanent cultivated areas which are 15 ha or bigger from the land cover shape file.
- I've exported that to a new output layer
- I've buffered the 500 m around all dams
- I've added the conservation area layers
- I used the intersect tool to over lay the layers and now I can see the portions of land (from land cover shape) that have the following criteria:
- are within 10 km of the town center
- are within 1 km of major roads
- are not in urban or permanent cultivated areas
- are not within a distance of 500 m of a dam
- are not within conservation areas
I'm not sure if I should have buffered the dams and of that was the best option.
But what I'm actually struggling with is step 7 of the first list. I'm not sure how to tackle this problem.
Could someone please help me? I would really appreciate any help.
Kind Regards
Francois Bekker
NB: if you need more info to help me feel free to contact me on gulu@sun.ac.za then we can perhaps arrange a Skype call.
