A Spatial Reference System Identifier (SRID) is a unique value used to unambiguously identify projected, unprojected, and local spatial coordinate system definitions

learn more… | top users | synonyms

20
votes
6answers
8k views

Shapefile PRJ to PostGIS SRID lookup table?

I was wondering if there is such a thing as an shapefile PRJ to PostGIS SRID lookup table? Something that can translate the most standard shapefile PRJ definitions into the likely SRID. When using ...
11
votes
4answers
2k views

Looking for a pythonic way to calculate the length of a WKT linestring

I was quite unsatisfied with Calculating Length of Linestrings in WGS84 in Miles. It kept me wondering if there is a more convenient, Pythonic way to calculate the length of a WKT linestring according ...
8
votes
1answer
283 views

Using customized Coordinate System for Archaeological site data

I don't know so much about coordinate systems... In my office we use to deal with spatial data coming from archaeological sites. Each site has its own x-y-z coordinate system (GCS). Three simple ...
7
votes
3answers
3k views

How to insert a GeoJSON polygon into a PostGIS table?

I need to insert a polygon from GeoJSON to my PostGIS table. This is how the SQL query looks like. INSERT INTO tablename (name, polygon) VALUES ( 'Name', ST_GeomFromGeoJSON ( { ...
7
votes
2answers
2k views

What is the SRID of census.gov shapfiles?

I downloaded the county files from: http://www.census.gov/cgi-bin/geo/shapefiles2011/main I cannot figure out what SRID to use with them. When I am trying to generate a class file from ./manage.py ...
7
votes
1answer
2k views

How do I get a country border data set into my geography column?

I have a PostGis database with a multipolygon geography (as opposed to geometry) column. I'd like to fill it with the country border data available from ...
6
votes
1answer
109 views

Postgis 2.1 Inconsistent with spatialreference.org

The County of Napa, California, uses a projection "NAD_1983_StatePlane_California_II_FIPS_0402_Feet"; for example their roads.prj file has: ...
6
votes
1answer
183 views

How do I change an existing srs in QGis?

I am showing postgis data with srid 28992 (Amersfoort / RD New). But when I plot the geospatial data on a map (with openlayers plugin), the data is shown a hunderd meters off because the datum shift ...
5
votes
4answers
671 views

What is Spatial Reference System in Laymans Language?

I am trying to understand the concept behind the Spatial Reference System, Why is it used and what is so specific about the number. I went through many definations and almost all went over my head. So ...
5
votes
1answer
101 views

Is there a way to determine the datum used when all you have is a lon and lat?

I have a dataset of US intersections from 2011 that I'm going to be using in a project together with data based in WGS84. Included in the CSV file is a variety of fields two of which are the lat and ...
4
votes
1answer
3k views

Transforming geometry coordinates from SRID 4326 to SRID 3011

In SQLServer geometry field, I want to change the coordinates of geometry from one spatial reference system to another spatial reference system (from SRID 4326 to SRID 3011) by using ST_Transform. But ...
4
votes
2answers
79 views

Is there a command line tool for converting projection in .prj and GeoTiff to EPSG codes?

Is there a command line tool to convert a shapefile projection in the .prj file into corresponding EPSG code? I know that there is website http://prj2epsg.org/search for doing this online, but I ...
4
votes
2answers
636 views

ST_Distance is not delivering right results

I want to calculate the distance between lat/lon points. I tried the following queries: Select ST_DISTANCE(ST_GeomFromText('POINT(-73.97923 40.75571)', 4326), ST_GeomFromText('POINT(-73.974509 ...
4
votes
2answers
102 views

Storing SRID:4326 data as Geometry or Geography?

I used OGR2OGR to import SRID 4326 point data into MSSQL Server. Didn't realize that it defaults to creating a geometry column instead of detecting the data as 4326 and creating a geography column. ...
4
votes
1answer
340 views

PostGIS spatial reference ID (SRID) for regular cartesian coordinate system?

I would like to store a polygon as a set of 2D points represented as x, y coordinates of a Cartesian coordinate system. Which spatial reference can I use? Looking at my spatial_ref_sys table, all the ...
4
votes
1answer
788 views

how to add a custom SRID to Spatialite

I'd like to create a spatialite database and load it with shapefiles using the Mississippi Transverse Mercator (MSTM) projection, but it doesn't have an EPSG definition in the spatialite library of ...
4
votes
0answers
50 views

Adding data from PostgreSQL to Query Layer of ArcGIS for Desktop warns that given coordinate references are incompatible?

When adding data from PostgreSQL in a Query Layer I get the warning "The given coordinate references are incompatible" I have added many other layers with the same properties no problems, but I have ...
3
votes
2answers
2k views

ogr2ogr srs options: where is the well known definition determined?

In the ogr2ogr documentation it says that when using -a_srs srs_def: Srs_def can be a full WKT definition (hard to escape properly), or a well known definition (ie. EPSG:4326) or a file with a WKT ...
3
votes
2answers
8k views

How I get SRID from Geometry field

what is the function for getting SRID from Geometry field. I have inserted a shapefile into SQLServer table with Geometry field defined. I know the projection of shapefile is Swreff99_1800 ...
3
votes
2answers
214 views

ESRI projection to SRID?

I am looking at MapX and MapY coordinates. The docs say they are "truncated State Plane coordinates: NAD 1983 State Plane Louisiana South FIPS 1702 (US Feet)." I am trying to reproject into a common ...
3
votes
4answers
3k views

SQL Server Geometry to geography conversion

I have imported a number of Shape files from the ordnance survey using shape2SQL these have been imported as geometry however i would like to convert them to Geography and specifically to srid 4326 ...
3
votes
1answer
2k views

How to get the coordinate system from a PostGIS database?

My question is probably amazinlgy stupid, but I can't find the answer myself. I would like to extract from a database the latitude and longitude of points. For now, I'm getting x(the_geom) and ...
3
votes
3answers
525 views

How to find SRID for random polygon?

I'm testing spatial database performance on a dataset. Spatial objects in this dataset (stored as WKT in a flat text file) are random valid polygons which have vertex coordinates (x,y) where 100,000> ...
3
votes
1answer
89 views

Should I use a projection or not, and if so what SRID would be useful?

First off, I realize that this is perhaps not the most stackexchange-esque question. I am however having trouble finding a good source of information for this. So if there is a better place for me to ...
3
votes
1answer
269 views

How to mix coordinate systems in GeoDjango?

This is a beginner question about working with different coordinate systems in GeoDjango. I've got a GeoDjango object with a polygon field, stored as OSGB coordinates: class Region(models.Model): ...
3
votes
1answer
120 views

Strange exposure of a PostGIS layer in QGIS after importing OSM data into a database

I've imported a osm layer into my postgres/postgis database. osm2pqsql -E 3857 -c -S /usr/share/osm2pgsql/default.style -H localhost -W -d landslide -U postgres oberpfalz-latest.osm.bz2 During the ...
3
votes
1answer
898 views

add new SRID to sql server

Is it possible to add a new SRID to sql server 2012? I've tried insert into sys.spatial_reference_systems values (4938, 'GEOCCS["GDA94",DATUM["Geocentric Datum of Australia 1994",SPHEROID["GRS ...
3
votes
1answer
563 views

PostGIS 2.0 ST_Transform with Rasters cannot find custom SRID

I'm trying to calculate an average value in a buffer around a point. Given a raster in EPSG 4326 and a similar point, this is fine, except that the values will be skewed as they are not projected in ...
3
votes
0answers
232 views

Creating Ellipse in WGS84, but with metric parameters

I have the function --Ellipse(x,y,rx,ry,rotation,#of segments in 1/4 of ellipse) SELECT ST_Translate( ST_Rotate( ST_Scale( ST_Buffer(ST_Point(0,0), 0.5, $6), $3, $4), $5), $1, $2) I have points in ...
3
votes
0answers
176 views

ArcGIS and SqlServer.Types: Does feature.Shape.SpatialReference.FactoryCode == srid?

I created a test implementation of the ESRI Geometry to WKT recipe provided by @SagebrushGIS. It seems to work great, but I'm wondering if the SRID value expected by Microsoft.SqlServer.Types ...
2
votes
1answer
88 views

Problem while Reprojecting

When I try to transform geometries from SRID 2321 to 4326, the transformed coordinates are swapping. Why is this happening? Below are the details Source SRID - EPSG:2321 Source Data Projection ...
2
votes
1answer
104 views

PostGIS ST_Contains query returns null

I have a shapefile of all US States that I've imported into a table with a multipolygon geometry column. (SRID 4326) I perform a spatial query based on lat/lon to return the state abbreviation. This ...
2
votes
2answers
2k views

Problem when calculating longitude and latitude for points

I have a PostGIS database with SRID=900913 (Google Mercator) and I would like to know the latitude and longitude of points. I use this command: ST_X(ST_TRANSFORM(the_geom,4283)) Following what is ...
2
votes
3answers
115 views

Problem with Geometry SRID in PostGIS

I ceated my table (borne) in PostGIS id_borne serial NOT NULL, num_borne character varying, shape_borne geometry I successfully changed the SRID of my table using select ...
2
votes
1answer
459 views

How to transform ETRS to EPSG?

I have data in the ETRS 89 LAEA format (SRID: 3035). But I have problems to transform it. Example data: N2736 E4541 I want to transform it to EPSG WGS84 (SRID: 4326), to check the coordinates on ...
2
votes
3answers
393 views

which map projection should I use to calculate distance in Poland

I'm using/learning geodjango + postgis, and I'm trying to calculate distance between 2 cities in Poland. First using WGS84/4326 I define 2 points, and then after transforming this points into ...
2
votes
1answer
619 views

Postgis | Problems Reprojecting a Point from UTM ED50 to GEOGRAPHIC ETRS89

I've got a POINTS PostGIS table in the 23030 (ED50 UTM 30N) SRID. I'm having a lot of problems trying to reproject those points from ED50 UTM coordinate system to ETRS89 Geographic (lat/long) ...
2
votes
1answer
2k views

How to fix incorrect SRID of the geometry column? [duplicate]

I've been told to use AddGeometryColumn to properly add a column with correct/preferred SRID. however I wonder if it's possible to fix/change the current column instead of adding a new? If there's no ...
2
votes
1answer
195 views

Calculating points in the USDA's Cropland Data Layer coordinate system

I need to integrate against the USDA's cropland data layer. They've got a demo and some API docs. The important query I need to run is this, given an (x, y) of say (1551459.363, 1909201.537): ...
2
votes
2answers
599 views

Why is Spatialite delivering “Invalid SRID” error message

Qspatialite in QGIS 1.8 (and also Spatialite-gui) delivers an "Invalid SRID" error message when I try to load shapefiles with a SRID value of 3814 (Mississippi Transverse Mercatur). The SRID is ...
2
votes
1answer
71 views

How can I get proj4text from srtext?

I have a custom projection used in some shapes on a prj file. I want to insert this projection in the table spatial_ref_sys PostGIS. The data in the prj file will SRTEXT table field, how can I get ...
2
votes
1answer
80 views

Is it possible to get coordinate system name from SQL Server geometry type?

I need to get the name of the coordinate system of a geometry type field in SQL Server 2008 R2 (for example NAD_1983_UTM_Zone_14N or GCS_WGS_1984 or other). Is this possible?
2
votes
0answers
19 views

Problem with postgres/quantum converting long/lat to suitable projection/SRID [duplicate]

I'm sure it's a simple question but this is all very new to me and after a lot of internet searching my points are still in the sea! I have a set of UK postcode data that I have converted into ...
2
votes
1answer
382 views

Problem with writing the srsName into gml output in OpenLayers

I am trying to write out my geometry in gml format after it is drawn in OpenLayers. Actually it is working fine, I get the gml like this: <gml:Polygon> <gml:outerBoundaryIs> ...
2
votes
0answers
134 views

How to do Spatial Tools Projections between different projection types

I am working with the SQL Spatial Tools from http://sqlspatialtools.codeplex.com/ And a variety of data sets, primarily from LINZ and Google. These involve working with projections for 4326 (WGS84?) ...
1
vote
4answers
866 views

finding the definition of missing srid in postgis

I am converting a spatial Oracle database to POSTGIS, and one of the problems I encounter is that we use SRID in Oracle that do not exist in POSTGIS. I am talking about the following SRID: 90112 : ...
1
vote
1answer
427 views

PostGIS not converting GIS data into latitude/longitude values

I am running PostgreSQL and PostGIS. I am trying to do something mind-numbingly simple: determine the latitude and the longitude of a point. Unfortunately, PostGIS stubbornly refuses to transform the ...
1
vote
1answer
24 views

Why does my query not run since SRID are the same?

I am running this query: SELECT source,ST_AsText(ST_ClosestPoint(roads.geom,ST_GeomFromText('POINT(22.256 39.569)'))) FROM roads ORDER BY ST_Distance(roads.geom,ST_GeomFromText('POINT(22.256 ...
1
vote
1answer
1k views

PostGIS - Geometry or Geography find points within distance in meters

I have a requirement where I need to store lat/long coordinates for locations all around the world. I then need to query for those locations that are within a specified distance (in meters) from ...
1
vote
1answer
197 views

Reprojecting in postGIS from 900913 to 4326. Wrong coordinates

I'm working with postGIS 2.1 I have a table called 'xacementos' created with the srid: 900913. I took the points coordinates from google maps and I want to convert them to SRID:4326 to show the points ...