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Questions tagged [geospatial]

pertaining to the geographic location and characteristics of natural or constructed features and boundaries on, above, or below the earth's surface; esp. referring to data that is geographic and spatial in nature.

Geospatial (adj) Definition: pertaining to the geographic location and characteristics of natural or constructed features and boundaries on, above, or below the earth's surface; esp. referring to data that is geographic and spatial in nature.

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Distance Value from RavenDB Spatial query

Is there a way to get the distance calculation value from RavenDB when doing a spatial search. I tried converting the suggested _ = SpatialIndex.Generate(r.Latitude, r.Longitude) to distance = SpatialIndex.Generate(r.Latitude,…
Eric Rohlfs
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How to perform a geo search inside the difference of two circles in MongoDB=

Is it possible to perform a geospatial search in MongoDB in the resulting area from the difference of two circles. Let's say that I have a circle A of radius x and another circle B of radius y where y > x. I need to find all the points that are…
GuidoMB
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Solr performance on EC2 for geospatial queries

EC2 Configuration mlarge machine - 4 CPU, 7.5G, EBS volume, JVM Memory - 6G, Solr Version tested on both 4.0-ALPHA and 3.6.1 schema.xml
curiosity
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What's the tile format used by leaflet?

I'm planning a website which will use huge schematics, that is, raster images that are not photos. If they were photos and I were interested on displaying them as so, I would use either zoomify, IIPImage or PanoJS. Although all of these solutions…
dsign
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MySql Geospatial bug..?

This question is for Mysql geospatial-extension experts. The following query doesn't the result that I'm expecting: create database test_db; use test_db; create table test_table (g polygon not null); insert into test_table (g) values…
sivabudh
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Algorithm for routing through space filled with polygons

I have a (geographic) map built up of polygons depicting land and a boat trying to get from A to B without hitting any of the land. Preferably, it should follow the shortest available path. I have an algorithm that works most of the time, but it is…
Jaap Versteegh
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Best way to search a point across several polygons

I need to match a given point (lat, lon) against several polygons to decide if there is a match. The easiest way would be to iterate over each polygon and apply the point-in-polygon check algorithm, but that is prohibitively expensive. The next…
user1474341
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How to find points, sort them based on closeness, and get 1-20, 21-40, etc. Efficiently using Myisam and mysql and spatial index

Say I want to find 20 closest business near me. Latter I want to see the next 20 closest, etc. Yes I have myisam. I have spatial indexes on the point. I am looking for actual SQL command I should send. To make it clear: Note: I am using mysql…
user4951
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R plot grid value on maps

I have several file with the following format: lat,lon,value. I would like to plot a colored grid map with such value for each one of the lat,lon point and overlapping it over the EU map. Thanks for support.
user1256539
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update trigger updating all rows in target, not just updated?

I have a very suspicious feeling that this update trigger is updating ALL rows on the target, not just those that satisfy the "update(shape)" test. Performance was fine 'till I added the second operation. A single spatial join occurs much faster,…
tpcolson
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Sql Server 2008 Spatial query slow

I have a database with a datatable within 2 000 000 lines with 1 geography type field containting Point. In another datatable I have 600 lines with 1 geography type field containting Polygon. This query to retrieve all the POINT in a POLYGON is very…
seb49
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Solr Distance Filtering

I am trying to do distance range search using Solr. I know its very easy to do a search for filtering within the 5km range &q=*:*&fq={!geofilt pt=45.15,-93.85 sfield=store d=5} What I am after is how to do the same thing if I am looking in a range…
user975027
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Dividing a geographic region

I have a certain geographic region defined by the bottom left and top right coordinates. How can I divide this region into areas of 20x20km. I mean in practial the shape of the earth is not flat it's round. The bounding box is just an approximation.…
rajan sthapit
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Intersecting Polygon in R, importing polygon for Spatial Clustering Analysis in Spatstat

I am trying to import a polygon into R using the readShapePoly command and turn the polygon in to a border using as(filename,"owin"). I keep getting the response that the polygon contains duplicate vertices and self-intersecting polygons: Polygon 1…
user1378602
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Is there a convenient way to create spatial index with Sqlalchemy or Geoalchemy?

Yesterday someone told me that Geoalchemy was a good choice to support spatial extensions if I want to use Sqlalchemy. It really did good. Thanks for him a lot. But I have not found a convenient way to create spatial index with Geoalchemy. Must I…
flypen
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