GIS Stack Exchange
GIS Stack Exchange

Most Popular

more tags
1500 questions
60
votes
7 answers

Creating Vector Polygons with rendering performance like GISCloud?

I have been looking for a solid solution which would allow me to create a web map and overlay vector polygons without taking forever to load such data with the goal of allowing me to make each polygon display a different color on a hover event. As…
NetConstructor.com
  • 2,320
  • 5
  • 25
  • 36
60
votes
11 answers

Removing small spaces (slivers) between polygons

I have a set of polygons representing administrative districts. The districts were digitized by hand, and there are small spaces (slivers) between polygons where the polygons should be touching. How can I have the polygons snap together, removing…
zoo
  • 711
  • 1
  • 5
  • 4
60
votes
3 answers

What is Lanczos resampling useful for in a spatial context?

GDAL includes a resampling method beyond the normal mix of nearest neighbor, bilinear, cubic and splines: "Lanczos windowed sinc resampling". I understand that its a convolution filter, but unlike images where results tend to be subjective, the…
scw
  • 16,391
  • 6
  • 64
  • 101
59
votes
6 answers

Why is the 'straight line' path across continent so curved?

This is the result of mapping the straight line path from a point in US to Poland using Distance Measurement Tool. Also, planes from Asia to US would travel almost over North Pole. Why is the path so curved? I agree that this is a flat…
Lazer
  • 701
  • 1
  • 5
  • 5
59
votes
5 answers

What are Esri's new ArcGIS for Professionals and ArcGIS Pro?

After looking through all the stuff that was released or talked about at the Esri UC 2013 I am still genuinely confused by what ArcGIS for Professionals is. I will admit that it looks pretty cool, and has some sweet features, but I just do not know…
Craig
  • 4,570
  • 7
  • 40
  • 71
59
votes
7 answers

Calculating Latitude/Longitude X miles from point?

I am wanting to find a latitude and longitude point given a bearing, a distance, and a starting latitude and longitude. This appears to be the opposite of this question (Distance between lat/long points). I have already looked into the haversine…
Jason Whitehorn
  • 783
  • 1
  • 7
  • 8
59
votes
11 answers

Obtaining up-to-date list of US ZIP Codes with Latitude and Longitude Geocodes?

NOTE: This began as a question on Stack Overflow, which has subsequently been closed. I also noticed a similar question about Most Up-To-Date Source for US Zip Code Boundaries, but I believe this question is different in that I'm not looking for…
Ben McCormack
  • 701
  • 1
  • 6
  • 7
59
votes
3 answers

Openlayers Animation Examples and Algorithms

i wonder for a long time if people in this community uses openlayers for animation needs. we have know this that animating on browser is a little bit exhausting for it but when a map meets with animation, I believe that good things will be out. Do…
urcm
  • 22,533
  • 4
  • 57
  • 109
59
votes
9 answers

Choosing colour-ramp to use for elevation?

This is maybe rather subjective as it concerns style, but I would like to have a few decent colour ramps for my DEM when it is layed over my hill-shading. I have created the Swiss hillshade model as shown here, but I'm not too convinced that the…
Robert Buckley
  • 10,175
  • 14
  • 76
  • 156
58
votes
7 answers

Getting list of coordinates for points in layer using QGIS?

I've got a layer in QGIS that is comprised of points. Its attribute table doesn't have (show) the corresponding x and y coordinates for each point. Is there a way for me to extract a list of coordinates for those points? (ideally into a CSV, but not…
hpy
  • 3,157
  • 13
  • 43
  • 43
58
votes
7 answers

Importing DWG into QGIS project?

I have a lot of DWG files like basemap, and water and wastewater network. How do I import these files into my QGIS project?
BESCI
  • 637
  • 1
  • 6
  • 6
58
votes
11 answers

Seeking Free and Open Source GIS Desktop packages?

Can someone give me a list of free and open source GIS desktop packages?
TheSteve0
  • 2,314
  • 2
  • 20
  • 23
58
votes
3 answers

What is the purpose of PostGIS on PostgreSQL?

PostgreSQL already supports spatial data types, operators and indexing. What does PostGIS provide exactly that made it necessary to exist as an extension to PostgreSQL? Why don't we all just use PostgreSQL's spatial functionality?
Zeruno
  • 769
  • 1
  • 6
  • 12
58
votes
6 answers

SQL query to have a complete geojson feature from PostGIS?

I would like to get a geojson feature with properties from PostGIS. I have found an example to have a feature collection but I can't make it works for just a feature. SELECT row_to_json(fc) FROM ( SELECT 'FeatureCollection' As type,…
Below the Radar
  • 3,593
  • 1
  • 31
  • 58
57
votes
5 answers

What are the benefits of hexagonal sampling polygons?

I am always on the lookout for useful methods to sample or partition study areas (usually in the form of raster datasets) into smaller units. Recently, I read an ESRI blog post about a new tool for creating sampling hexagons. Although the hexagons…
Aaron
  • 51,658
  • 28
  • 154
  • 317
1 2 3
…
99 100