difficult to process and manage because the size is usually bigger than the limits software can normally deal with.

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5
votes
4answers
1k views

Need a location based social network data set

I'm looking for a data-set of Geosocial network consisting of Gps trajectories, chek-in,geotag contetnts and stuff like these available for research purposes. I'd really appreciate it if you can ...
11
votes
4answers
494 views

How to generalize coastlines?

I have a large set of data points that essentially represent the coastline of the world. I don't know the exact resolution but I'd say it's in the neighbourhood of 5-10m. Imagine a set of points ...
3
votes
1answer
931 views

XY to Line tool crashing

The problem I'm encountering is simple. I have a shape file of points (about 8 million). They have three XY pairs that I am attempting to create XY lines from for purposes of measuring distance. ...
3
votes
1answer
674 views

Online/cloud storage options for GIS file-based data [closed]

I am currently looking into online/cloud-based storage solutions in general and also for my GIS data which consists of shapefiles, rasters, file geodatabases, and the like (no relational databases). ...
4
votes
3answers
389 views

Free good quality small scale (1:70,000) global coastline datasets?

I've been searching for a few days for the most accurate world coastline datasets.. Does anyone know where l can get coastlines at scales of 1:250 000, 1:2 000 000 and 1: 70 000. I've tried using the ...
2
votes
1answer
249 views

Are there any efficient methods for processing ArcGIS-based database tables outside of the ArcEtc program library?

Let us say, for the sake of argument, that you are working with a table that is over 2 GB in size (so .dbf is automatically ruled out... right?). To even create such a document, ArcGIS requires that ...
7
votes
9answers
2k views

WMS with Access Control (ACL) for different users? Or solution for thousands of points on web map?

I have a set of Sites in the thousands. Not all users see same the same Sites on the map - thus ACL. Data is stored in a non-GIS database (mssql, ora, etc) and right now is retrieved with a standard ...
8
votes
4answers
2k views

Queries returning very big datasets in PostGIS

I have a PostGIS query that will return several million rows: SELECT t1.id AS id1, t2.id AS id2, ABS(t1.mean_h - t2.mean_h) AS h_diff, ST_Distance(t1.the_geom, t2.the_geom) AS dist FROM ...