Questions tagged [srid]

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

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1answer
114 views

Reprojecting in PostGIS not working as expected

I just reprojected with PostGIS tree layers using this function: select UpdateGeometrySRID('schema', 'table', 'geom', 3857) These tree layers are contiguous. The problem is, when I open it on QGIS to ...
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2answers
71 views

How to reproject a table using PostGIS

To reproject a table into different CRS is a very common practice in geospatial analysis. However, I am still struggling to reproject my table in PostGIS, after reading loads of Q&A related to ...
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1answer
28 views

Mixed SRID's when using users Lat & Lon coordinates to perform KNN through PostGIS when building points to jsonp

I have managed to create a script that passes the users lat and lon to a postgres query that finds the nearest 5 pubs to a users location. However, on execution I realised no matter what lat and long ...
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3answers
179 views

How to overlay layers with different SRID using QGIS and PostGIS? [closed]

I have a map of the Netherlands imported from a SHP-file into my PostGIS environment with SRID 4289 (Rijksdriehoek Amersfoort). When I connect using QGIS to the PostGIS database and add the layer with ...
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1answer
54 views

My geometry appears far away from the real

I'm kind of new on PostGIS. I have the coordinates (UTM) in a table, and I need to update the geometry field based on that coordinates. The SRID in the table is 32717. I tried this sentence UPDATE ...
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1answer
88 views

Google Maps satellite view footprints not congruent to street map view

I am trying to draw the layout of a building and project them to a web map using Django and Leaflet. I am using a satellite image to get the correct latitude and longitude and then I send the ...
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0answers
27 views

Different results for GEOGRAPHY and ST_TRANSFORM query on geo_point field

I am finding properties that are within 20K distance using ST_DWithin. But when I try with ::GEOGRAPHY casting the result is different from ST_Transform. Note: SRID of geo_point field is 4326 Indexed ...
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1answer
89 views

How to create custom CRS with custom SRID in PostGIS?

In our app we are using several CRS - one of them is a custom one. I'd like to turn it into a proper CRS that PostGIS can fully support (e.g. administering valid transformations on it with something ...
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3answers
232 views

Missing geometry type and SRID in PostGIS

I created a view with select a, st_union(geom) from table group by a srid: 25832, geometry type: Multipolygon The view has no SRID and the geometry type is "GEOMETRY". Now i want to ...
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1answer
80 views

SRID not updating

I have created a point geometry using ST_GeomFromText function in PostGIS and simultaneous set the SRID to 3857. Alter table data.trips_42779 add column geom geometry; UPDATE data.trips_42779 SET ...
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0answers
43 views

CRS definitions in QGIS

I have a drone software package that wants to output my data in CRS 32612. QGIS seems to load and view it fine but when I extract contours from a DEM at this projection it tries to write the ...
4
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1answer
70 views

Transformation on insertion into PostGIS

If I have a specific SRID set on a geometry column in PostGIS, say 4326; if I then insert geometry with a different SRID, say 4283, what SRID will be stored in the database, will PostGIS transform the ...
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0answers
37 views

Is a SRID an attribute of geometry or geometry column? [closed]

I'm not an expert. Yesterday I found out that SRID in PostGIS is property of the column - an actual constraint that is even stored in pg_constraints table and then retrieved through geometry_columns ...
4
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1answer
116 views

Different results for same transformation on different PostgreSQL/Postgis installations

While migratring web services from one server to another, we noticed different transformation results for the same query. In our case, a Polygon is supplied in WKT with SRID=4326 and a query is sent ...
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2answers
80 views

Is there any reason to use or know anything other than WGS 84 (SRID 4326) or Web Mercator (SRID 3857)? [closed]

I'm new to GIS and learning about SRIDs. Are there still other relevant or commonly used SRIDs?
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2answers
71 views

How to manage different SRID data in same database table? [closed]

My data is in two different cities and three different EPSG code area. (Database is PostgreSQL/PostGIS.) So I think, I can not set SRID values by data. Making 3 different table is difficult. How can ...
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2answers
107 views

Geometry in PostGIS Table wrong SRID and type [closed]

I have loaded some points into a table as Multipoint, they have come through with an SRID of 0. I need to change these to have a SRID of 7844 and also change them to be of type Point. There are other ...
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1answer
256 views

ST_Transform not working SRID

I have some MultiPolygon geometries in SRID 4258 and am trying to transform them into SRID 4326. When I run the following command, however, the output still seems to be in SRID 4258. Command: SELECT ...
3
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2answers
502 views

What exacly ST_SetSRID in PostGIS does?

I am new to DBA and PostGIS. I am developing an application using PostgreSQL and PostGIS where nearby locations need to be queried. I created a sample table as below: CREATE TABLE foo (geog ...
2
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1answer
93 views

Extracting a Point from MuItipoint and use it for a ST_DWithin query

I have a MultiPoint geometry column which has only one point (DB is a live server which cannot be changed now). I need to find all points within a certain distance from a fixed point I provide to the ...
1
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1answer
476 views

Getting geometry column integer SRID from a GeoPandas geodataframe?

The primary answer to Adding GeoPandas Dataframe to PostGIS table? requires entering the geodataframe geometry column's integer SRID. Getting the CRS attribute using the crs attribute like so import ...
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1answer
60 views

Should ST_OrientedEnvelope results differ depending on order of transform?

I have a PostgreSQL db with a table with geometry multipolygons stored in srid 4326 (lat/lngs). I need to calculate the area of the oriented envelope around each polygon, and I am using ...
2
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1answer
257 views

Trying to set SRID for a Geometry

I imported precinct data from the Harvard Dataverse into Postgres 9.3 using the PostGIS Shapefile Import/Export Manager. It creates a geom column with a SRID of 0. I think the data is projected as ...
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0answers
72 views

PostGIS add polygon in meters around a point (lat,long)

I have a point in my PostGIS database that is put in using the lat/long using srid: 4326. The point represents a car driving, now I want to add a polygon of the cars shape around this point and update....
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1answer
195 views

Use SDE.ST_GEOMETRY functions in a custom function

I have a dummy query where I generate an SDE.ST_GEOMETRY point: select shape as srid_test from ( select sde.st_geometry ('point (10.01 50.76)', 4326) as shape from ...
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0answers
48 views

ArcGIS feature table SRID is NULL

I am using Oracle to store ArcGIS data. I have created my table named PARCELS from ArcCatalog, and I inserted some data using ArcMap. So when I run the following SQL query: select * from MDSYS....
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1answer
110 views

Translate custom MKT projection to proj4 string?

I need to use a specific custom projection that not exist as SRID into standard spatial_ref_sys of my GIS, PROJCS["Conica_Equivalente_de_Albers_Brasil", GEOGCS["GCS_SIRGAS2000", DATUM["...
2
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1answer
95 views

Defining distance between points in meters

I want to calculate the distance in meters between two points but I am getting an obscene result 5497980.47338251 Here is the query I made: SELECT ST_Distance(ST_SeTSRID(ST_MakePoint(6761331.47, ...
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2answers
170 views

Geographic coordinates in PostGIS to QGIS and shapefile layers

I've got in PostgreSQL/PostGIS the table "points" with latitude and longitude fields. I've done update points set geom = st_point (longitude, latitude); and also select updategeometrysrid ('points'...
3
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1answer
360 views

Representing projected coordinates from several UTM zones into the same one

I have a database with coordinates in WGS84 (4326) that all of them belong to Italy. Italy is split in two more or less equal UTM zones, 32 and 33. I need to transform those geographic coordinates to ...
9
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3answers
2k views

SRID and Name relationship

PostGIS comes with a table of spatial reference systems with each one being identitfied by a SRID. However, from a user's perspective, SRID is just a number and doesn't tell them much. Is there a ...
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1answer
92 views

PostGIS: Problem with SRID conversion

I am new in PostGIS and I am trying to convert a geometry field to GeoJSON Lat/Lng for visualization in a map as a layer. I had a .HSP file that I exported to PostGIS with OpenJump program. The .prj ...
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1answer
381 views

With Spatialite, how do I run PtDistWithin with meters?

So the problem is that I have a set of multipolygons and points and I need to be able to query the data with a given point to check which ones are within 'x' km. Initially my SRID was 4283 but I ...
9
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1answer
1k views

Using shp2pgsql instead of ogr2ogr to import shapefile to PostGIS? [closed]

I may very well be doing something wrong here, but: If I import some shapefile to a PostGIS database using shp2pgsql, I have to first figure out the SRID/EPSG of that shapefile. I think this is, at ...
0
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1answer
120 views

Setting coordinate system in CARTO Builder map?

I uploaded a polygon layer in EPSG 25830, called 'parcels'. I know that the geometries are reprojected and the dataset has two geometry columns: 'the_geom' in EPSG 4326 'the_geom_webmercator' in ...
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2answers
7k views

Is SRID 4326 Lon/Lat or Lat/Lon?

I built a wep app storing GPS coordinates, as SRID 4326. Coordinates are stored as Lon/Lat, and that was working fine on MySQL 5.6 and MySQL 5.7. Since I upgraded to MySQL 8, I get the following error ...
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2answers
811 views

including SRID in WKBWriter in Shapely doesn't work

I want to encode coordinates of LineString in WKB with the SRID included wkbwriter = shapely.geos.WKBWriter(shapely.geos.lgeos, big_endian=False, include_srid=True) geo = wkbwriter.write_hex(...
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2answers
473 views

Different SRID shown in QGIS and PostGIS for the same data

I have data stored in PostGIS. When I view its properties in QGIS, it says: SRS: EPSG:4326 - WGS 84 However, when I want retrieve the SRID value directly using the Find_SRID function, it returns 0. ...
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2answers
545 views

Wrong Calculated distance in PostGIS

I have downloaded Malaysia map from opensteetmap website and I have started to work on it in PostGIS. I need to find out the distance of some points to the nearest street over the map, so I used this ...
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0answers
560 views

SQL Server - ESPG:4326 data stored in Geometry column

It seems that the Microsoft SQL Server Geography data type is better suited for lat/lon because Geography "stores ellipsoidal (round-earth) data, such as GPS latitude and longitude coordinates." ...
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0answers
41 views

Create custom Non-North/Rotated SRID

Often in the hard rock mines that I consult for, they use a local grid coordinate system. The area is typically small <20km x 20km so curvature of the earth is not a major problem. Typically I ...
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1answer
501 views

How to convert a SRID/SRS in PostGIS into Well Known Text (WKT)?

Is there a PostGIS function for obtaining the WKT of an SRID in PostGIS? By WKT, I mean the ones that can be uploaded to spatialreference.org. I'm trying to create a new SRID/SRS by tweaking ...
4
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0answers
108 views

create custom SRID from OGCWKT

I wanted to create a new SRID for use in PostGIS. My goal is to have a SRS that can cover an entire state (instead of have multiple zones as in SPCS). For example, I wanted to create a new SRS for ...
0
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1answer
544 views

Oracle equivalent to postgis EPSG 4326 “geometry” type

We have polygons stored in Oracle SRID 8307 (geodetic datatype), but need to perform various operations on this layer in a 2d cartesian/non-geodetic system based on the geographic coordinates. I.e. ...
0
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1answer
72 views

Deciding whether to cast or Project when meters needed for ST_Distance?

I have a database and I am using geoms to build polygons around points. I need to do st_distance, st_area, st_overlaps, st_union, and st_instersects. also using st_x and st_y and st_project, so ...
2
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2answers
674 views

Reproject SRID using DotSpatial

I'm nota GIS guy so I need some help. I need to reproject from one SRID to another. I'm trying to take global lat/longs (4326), reproject them to a local SRID (2336). This is basically the line of ...
0
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2answers
622 views

query to check srid of features in feature class? [duplicate]

What query should I use to check the SRID of the features in a feature class? The storage type of the feature class in st_geometry? I tried the following query but no luck : select top 1 [...
4
votes
1answer
180 views

Find projected coordinate system

I have lots of (multi)polygons generated with this tool: http://gis.ucla.edu/apps/click2shp/ It provides a zip with dbf, shp, shx, prj files. The prj file contains the following: GEOGCS["...
3
votes
1answer
605 views

How can I add custom projections to the default spatial_ref_sys table in PostGIS?

The data I work with requires me to project between WGS84 (4326) and OSGB (27700), the default projection in PostGIS is using the older less accurate version of the projection. I am trying to add ...
3
votes
2answers
714 views

How to find good meter-based projection in PostGIS

I have a set of point geometries that I would like to cluster together using ST_ClusterDBSCAN. Unfortunately, it doesn't seem to work for WGS84 and requires a meter-based projection. Every tutorial ...