The science that studies the lands, the features, the inhabitants, and the phenomena of the Earth
3
votes
2answers
83 views
At the northpole, which way is east? [duplicate]
If a person stands on the north, or south pole. How do they determine which way is east/west?
2
votes
1answer
80 views
I would like to know about Careers in GIS [duplicate]
I am currently doing my MS software engineering. I am very much interested in GIS. I would like to know about the various opportunities available in this field and also the skills that i will have to ...
19
votes
2answers
290 views
Are ellipsoids a mathematical necessity?
The literature usually just tells us that the Geoid is complex to describe mathematically and that we therefore fit different Ellipsoids to approximate it.
Are these Ellipsoids mathematically ...
2
votes
0answers
53 views
Critera for geometry or geography
What criteria do you need to take account to before you choose geometry or geography map?
Is there a book or page about it?
3
votes
2answers
124 views
Several questions about using spatial data?
If you have spatial data for SQL server, can you use the spatial data (both geometry and geography) in another application for instance ESRI ArcGIS?
Is spatial data a standard that every GIS ...
5
votes
3answers
130 views
postgis : is the operator <-> works for Geography also?
With recent postgres//postgis version, you can now use the operator <-> to find
nearest rows to a point :
Indexed Nearest Neighbour Search in PostGIS
Correct me if I'm wrong, but according ...
0
votes
0answers
182 views
How to search a PostCode in a Radius using sql server 2008 GeoGraphy
I followed this blog http://blogs.lessthandot.com/index.php/DataMgmt/DataDesign/sql-server-2008-proximity-search-with-th and did everything which was guided and I am glad things went fine, my table ...
1
vote
0answers
388 views
How to project geographic coordinates (lat/long) to a cartesian system (albers equal-area)?
I am using this matlab package http://www2.ocgy.ubc.ca/~rich/map.html#examples to project the latitudes,longitudes of my data to a specific projection.
For this particular case I am using albers ...
1
vote
0answers
99 views
Graph of a specific area of USA
I am trying to get the network graph of a specific reason of USA. I have got a couple of options. One of them is using osm2po tool to extract the nodes and edge table from the osm map of a specific ...
2
votes
1answer
1k views
Insert Geography data into SQL Server 2008
Can someone guide me to or give me an example on how would one go about insert/query Geography data in Sql Server 2008 ( Polygon with 4 points and Point in specific) using C# EF or Linq2Sql.
I've ...
0
votes
0answers
22 views
Reproject geographic data SQL Server [duplicate]
Possible Duplicate:
Is it possible to reproject spatial data using SQL Server?
It is possible to repreoject a table (geography type) which has the 4326 SRID into a new SRID?
3
votes
1answer
666 views
Open Source Tools for Mobile GIS app development?
I want to create a complete Map application with the facilities of edit geometry and attributes of layers. The server and client for the application should be some open source tools. The application ...
2
votes
2answers
286 views
Geoserver uses geometry, not geography
When using a SQL database as the store, Geoserver requires that the spatial data are stored in a geometry, not geography column. Naturally, as we are dealing with geospatial features and not just ...
3
votes
2answers
191 views
merging block group data that uses 2000 geography with 2010 geography
I would like to combine data sets from 2010 which use 2000 geography with 2011 data that use 2010 census geography. The data is from the contiguous US and is either at block or block group level. I am ...
1
vote
1answer
1k views
Issue merging multiple polygons using ST_UNION
Totally brand new at using PostGIS, my first post here on GIS. Apologies if the answer to my question is obvious!
I've got regional data loaded into a PostGIS table and want to merge regions that ...
9
votes
2answers
581 views
Storing GML surface in PostGIS
I'm using PostGIS 2.0.0 and would like to store a GML Surface in a way that allows calculating intersections between that surface and various points and lines. In my case, the Surface will have one ...
3
votes
2answers
229 views
How to recalculate the the length of a geography linestring from nearby geography point in POSTGIS?
I have a geography type linestring
*route_geography geography(LineString,4326)*, its a route from point A to point B. Now I have a point C near that line. I want to find the nearest point on that ...
6
votes
5answers
418 views
Where can I get (USA) county neighbour relationship data?
I need a graph where each node is a US county and each edge represents a border shared between counties. I do not particularly care about the absolute position or shape of each county (though that ...
0
votes
0answers
75 views
Polticial Geography applied to GIS [closed]
I'd like to get some information on ownership for public, private and in general that applied to GIS. Is there a good website that I can read about it?
The reason I am asking is because there's data ...
2
votes
1answer
129 views
How to refine queries using GeoNames
The people on this site have been wonderful in helping me query a list of the worlds parks with something like this query:
...
4
votes
1answer
113 views
Getting what seems to be incorrect data from GeoNames
I have a hiking website. I am trying to query for parks big and small around the world where people could potentially go walking or hiking.
I was trying to use the GeoNames data and was using query ...
5
votes
2answers
165 views
How to get geographic information for American and world parks and cities?
I am working on building out park data for my web site. My site is about hiking, so I want to get a list of parks and cities in the world.
Is that possible? Where can I get/download/see such ...
22
votes
4answers
2k views
PostGIS: What are the pros and cons of geography and geometry types
My company uses geometry (the_geom) data type for storing geospatial data.
I've recently been acquainted to the concept of geography (the_geog) data type which, as I understand it, stores the SRID ...
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