0
votes
0answers
30 views

QGIS pixel/square cms using scale, dpi

The data (vectors) I'm using are 5cm in resolution. I think that resolution refers to accuracy of the data and not the image resolution. I've produced maps using the QGIS print composer and exported ...
2
votes
1answer
31 views

references for the colloquial naming of spatial data resolution

In our era of data deluge, many folks, including myself, quest for ill-defined "high-resolution" datasets. I suspect that colloquial description of spatial resolution as "high" or "low" is and will ...
5
votes
1answer
1k views

How to calculate the bounding box by a given center and scale in Android?

Given these conditions: a scale like 1:50000 the center of the viewport is 100°E, 20°N the size of the viewport is 400x600 How can I calculate the bounding box of the viewport? Update after ...
3
votes
1answer
2k views

Openlayers + WMS layer. Use scale or resolution + DPI

I have a problem with displaying map with WMS layer in Openlayers. I'm able to display it but the image of the map is not sharp especially at higher zooms. I have a documentation from the map ...
4
votes
1answer
725 views

Dimensional analysis/conversion problem: Map scale to image resolution (dpi)

Given a map scale of 1:17,200 and a raster whose cell size is 6 inches, what resolution (dots per inch) should I choose when exporting the map to an image in order to maintain the raster's native ...
2
votes
2answers
930 views

MapServer computes wrong map scales — off by factor 0.77. Or is it just me?

I've noticed in a current project that MapServer seems to get the map scale wrong, or then I'm wrong, but don't see how. My mapfile contains the following definitions: RESOLUTION 72 # this is the ...