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Results tagged with coordinate-system
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user 7505
A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions. This tag also refers to cartographic projections and coordinate system transformations.
0
votes
How do I request an output from a WMS service in a non-standard projection?
The WMS protocol is a mature (2009) standard, and not have alternatives to SRS parameter for express projection. EPSG code is another mature standard, and any standard projection have a EPSG (SRID) co …
- 2,354
0
votes
1
answer
284
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["D …
- 2,354
4
votes
1
answer
165
views
Is there a FOSS implementation for Discrete Global Grid System & Global Statistical Geospati...
This 2019 document, "GSGF Europe -Implementation guide for the Global Statistical Geospatial Framework in Europe" describes the harmonization of two standards:
INSPIRE D2.8.I.2_v3.1 of year 2014;
OG …
- 2,354
5
votes
1
answer
116
views
Projection planes that conform to the surface
The ISEA projection and other global ones (see DGGS standard) showed that the technology exists: it is possible to use a "coarse cover of polygons" (typically triangles, squares or hexagons), to cove …
- 2,354
3
votes
1
answer
211
views
How to see rHEALPix with QGIS?
Using the spatial reference +proj=rhealpix and comparing with "pure WGS84", in separate tables to avoid confusion in the QGIS renderization. But no visualization... is a QGIS bug? For example:
CREATE …
- 2,354
3
votes
How to see rHEALPix with QGIS?
The PostGIS inverse only works for registered transform
The PostGIS error, "ST_Transform: Input geometry has unknown (0) SRID" is sayng that we must to INSERT the projection in the spatial_ref_sys tab …
- 2,354
5
votes
2
answers
226
views
How to see ISEA with QGIS?
Using the spatial reference +proj=isea and comparing with others, in separate tables to avoid confusion in the QGIS renderization. But no visualization... is a QGIS bug? For example:
CREATE TABLE test …
- 2,354
1
vote
How to see ISEA with QGIS?
We can try again using fresh QGIS, with the new implementation of PROJ, version 9.5 or later. It say "Available forms: Forward and inverse, spherical".
The inverse was a years-old issue, finally impl …
- 2,354
1
vote
Get Lon Lat values from a GEOGRAPHY data type in PostGIS
Not need cast
Try to use this query.
SELECT ST_XMax(geog), ST_YMax(geog), ST_AsEWKT(geog)
FROM locations LIMIT 10;
it works for me.
- 2,354
5
votes
Why does Find_SRID return zero?
Complementing with 3 "as it's":
1. As John's answer of 2014,
SRID of 0 doesn't technically exist, it just means no SRID — ie, the default if you forget to set it.
Zero is a valid SRID, your Po …
- 2,354
1
vote
How to use ISEA projection?
This is a Wiki (!), please collabore editing here... Or adding a correct and complete answer!
Trying to answer
The problem in "how to use" was the area calculation, so, the alternative answers (please …
5
votes
2
answers
346
views
How to use ISEA projection?
The projection named ISEA - Icosahedral Snyder Equal Area has a (supposedly) good implementation in the PROJ Library, proj.org/isea, that is used by PostGIS, QGIS, etc. The example is agnostic - was e …
- 2,354
1
vote
0
answers
58
views
How does the ISEA-projection work? Looking for a didactic algorithm description
Is it a direct projection on 20 faces or on 32 faces?
Can I use PostGIS (with ISEA) to calculate and obtain cell-identifiers? For hexagons (like Uber H3) or for diamonds (like DGGRID's ISEA4D).
The o …
- 2,354
3
votes
1
answer
212
views
What are the geometric principles and GIS techniques that I can use to generate a postcode c...
Postal codes of Brazil and another countries are oriented to distribution logistics, and improvement of reliability in writing the postal addresses; but without much concern for the spatial correlat …
- 2,354
2
votes
1
answer
850
views
Getting SRID Well Known Text (WKT) metadata from PostgreSQL?
The SRID metadata is showed by, e.g., this web page:
Definition: Well Known Text (WKT)
PROJCS["UTM Zone 24, Northern Hemisphere",
GEOGCS["GRS 1980(IUGG, 1980)",
DATUM["unknown",
SPHEROID["GRS80",63 …
- 2,354