AnsweredAssumed Answered

Distance to nearest hub output not correct

Question asked by cmurua on Jan 11, 2015
Latest reply on Jan 24, 2015 by Dan_Patterson

Hello everyone. I'm having an issue with distances not being correct in the attribute table of a distance to hub analysis. I'm getting results with very small numbers, which I know are not correct. Here's some basics on the project:

 

Using QGIS, but I think this may not matter for this question.

 

Question to answer: Distances between a population centroid per tract to nearest store that accepts food stamps.

 

CRS on the fly is enabled. Disabling this still doesn't fix the issue presented here.

 

Study area is Clark County, Nevada in the USA.

 

My layers, all using EPSG:3718 - NAD83(NSRS2007) / UTM zone 11N:

 

Layer 1: Food stamp outlets (points)

Layer 2: Population centroids per tract. (points)

Layer 3: Census Tracts. (polygons)

Layer 4: Counties. (polygons)

 

Source point layer: Population centroids. Destination hub layer: Food stamp outlets. Measurement unit: Meters.

 

After running analysis: Output lines appear correctly in the canvas with same CRS as other layers by default. See output attribute table in the picture. Again,

the HubDist column numbers should not be that small. Any ideas on the issue?

. QDBjg.png

Outcomes