Exegesis Spatial Data Management
Posts in Category: GIS (general)
Opening ESRI Personal Geodatabases in QGIS
Posted by Steve Ellwood
01 March 2017
Categories:
ArcGIS
GIS (general)
Quantum GIS (QGIS)
In the more recent 64-bit versions of QGIS it is no longer possible to open ESRI personal geodatabases using the 'Add vector layer' functionality. However, it is possible to enable access to personal ...
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Comments(4)
How to hide the MapServer map file location on IIS (without writing any code)
Posted by Crispin Flower
12 April 2014
Categories:
GIS (general)
IIS
MapServer
WMS
We posted some notes a few days ago on how to set up MapServer WMS/WFS server on IIS. Someone called Dennis has commented appreciatively, but asked how to hide the location of the .map file and...
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Comments(0)
Calling a secured WMS / WFS service from mapserver
Posted by
03 February 2014
Categories:
GIS (general)
MapServer
Mapserver can be used in a cascading manner to call to other services, potentially combining them and maybe re-projecting before serving out again. Reasons for this might...
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Comments(1)
Using R with spatial data
Posted by
28 December 2013
Categories:
GIS (general)
OGR/GDAL
Projections
SQL Server
R is a cross platform statistical package which is becoming extremely widely used. It is modular and so there are all sorts of add ins available, including a number of sophisticated tools for...
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Comments(0)
How to set up a MapInfo DBMS table from SQL Server without a DSN
Posted by Crispin Flower
14 November 2013
Categories:
GIS (general)
MapInfo Professional
SQL Server
A quick note to say that it is definitely possible to use a SQL Server spatial table in MapInfo Professional without an ODBC DSN. There's not much about this on the web, and the normal methods of...
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Comments(1)
Optimising SQL Server spatial indexing - let sql do the work..
Posted by
01 October 2013
Categories:
GIS (general)
GISquirrel
SQL Server
Note – this will take a LONG time to run – quite possibly many hours - on a big dataset as it drops and recreates the index using different parameters – sledgehammer approach, but given the...
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Comments(0)
When GeoServer forgets about GeoWebCache
Posted by Crispin Flower
05 March 2013
Categories:
GeoServer
GIS (general)
WMS
I’ve been setting up some new mapping services (WMS) in GeoServer, with GeoWebCache allowing the map tiles to be cached for performance. For this to work, and for the WMS to use its cache of tiles,...
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Comments(0)
British National Grid in MapInfo
Posted by Mike Lush
28 November 2012
Categories:
GIS (general)
MapInfo Professional
Projections
A problem frequently encountered with sharing data between MapInfo and ArcGIS is that the British National Grid projection used by ArcGIS is accurate to 1 mm, whilst the standard projection used...
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Comments(2)
Calculating the extent of the geometry in a SQL Server table
Posted by Crispin Flower
20 March 2012
Categories:
GIS (general)
SQL Server
Andy Brewer passed me this, adapted from http://barendgehrels.blogspot.co.uk/2011/04/extent-of-sql-server-spatial-table.html This is a useful script, using CTEs (common table expressions) to...
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Comments(0)
MapServer and GeoServer (and tilecache) comparison serving Ordnance Survey raster maps
Posted by Crispin Flower
21 January 2012
Categories:
GeoServer
GIS (general)
MapServer
Ordnance Survey
Tilecache
With two WMS running off identical data on the same server, I thought it would be interesting to compare speeds and the map output. So I lined up a map request with identical parameters to both...
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Comments(0)
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