In a geodatabase, a mechanism for optimizing access to data based on the spatial column of the business table.

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33 views

Index to speed up ST_HausdorffDistance?

When comparing similarity of linestrings with ST_HausdorffDistance (or another type of similarity function), is there a way to use an index to speed up the search for similar linestrings?
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54 views

mongoDB query not working as expected

My mongoDB collection has all three types of shapes. A point is stored as { 'CE_NO': '_', 'E_NAME': 'RAILWAY BOOKING CENTER', 'SRCTYPE': 'Facility', 'geom': { 'coordinates': [ ...
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50 views

Indexing GIS data associated with user with timestamp

I have data for each user in this format user1:(timestamp,lattitude,longitude) user1:(timestamp1,lattitude1,longitude1)..... Here the 1 at the end of timestamp/lat/long is to specify a different ...
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187 views

Adding multiple layers to Tilemill from a single sqlite DB

This is a repost of a question I had over at the MapBox support board. Since I wasn't having much luck over there, I'm hoping I would have better success here. I'm having trouble adding more than a ...
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1answer
82 views

Spatial search performance on a collection of Points in a PostGis database

Let's assume you have a huge PostGis spatial table (using Postgresql 9.2, postgis 1.5) : BIGTABLE ( p Point, someData varchar ) which contains millions of records. Each record has been created ...
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208 views

create polygon adjacency matrix using python

I am trying to create an adjacency matrix from a set of polygons. That is, I have a bunch of polygons and I want to identify which polygons have a common edge or "touch" each other. Once I find this ...
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1answer
64 views

PostGIS Spatial Index not used after copying table

I am copying a PostGIS database from my computer to our webserver. I always had problems to copy the entire database using pg_dump and pg_restore so I am creating a new database on the server and copy ...
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37 views

How to serialize a HTML form to GeoJSON data?

I'm developing a Cordova/PhoneGap mobile application and using NodeJS for server and MongoDB as database. I need to serialize GPS data from mobile phone to send it to my webservice with latitude and ...
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1answer
185 views

Is it possible to use JTS for calculations on data in geographic coordinates?

I have some spatial data that has all of its coordinates as lat/lon pairs (with about 10 digits decimal precision), it's stored in a database as WGS84 data. Some of the data is represented as polygons ...
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1answer
45 views

Is there a way to force ArcCatalog to use a specific tessellation scheme for a SQL Server spatial index?

If I Recalculate a spatial index from ArcCatalog, the tessellation scheme is always set to "Geometry Grid". Even when the previous index was Geometry auto grid. ArcCatalog always changes it back. ...
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212 views

Spatialite, to speed performance, when should I create Views, Indexes or additional spatial tables?

I’ve got a large Spatialite database with a table of lines (roads, rail and water). I created a spatial index of the geometry to speed things up. This works amazingly well when I’m zoomed in ...
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23 views

How to create my own remote sensing index?

Using Landsat images how do I create my own indices to extract particular landuse? Are there any tool/ software for creating indices?