Questions tagged [postgis-raster]
PostGIS Raster is a PostGIS data type for storing and analyzing raster data.
90
questions
0
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0answers
7 views
Connecting MapServer to a raster table in PostGIS
I am new in MapServer and I want to visualize some raster tables in MapServer.
My mapfile is:
MAP
CONFIG "MS_ERRORFILE" "error.log"
DEBUG 5
NAME "milad"
STATUS on
SIZE 600 600
EXTENT -8321547 ...
0
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0answers
17 views
Are there annual or monthly NDVI high res datasets? [duplicate]
I'm looking for a source of high res (250 meter seems the highest res available for MODIS?) NDVI composite datasets for either an entire year (or monthly snapshots) if not, in a format I can import as ...
1
vote
1answer
52 views
Insert QGIS processed raster image (e.g. GeoTIFF) to PostgreSQL/PostGIS database by pyqgis
I've already connected to my database by a script, and loaded a vector a layer to QGIS.
Is there a way to upload a raster layer back to the database?
tablename = "***"
geometrycol = "***"
from qgis....
0
votes
1answer
88 views
How install postgis_raster extention on PostgreSQL 11.5?
I want install postgis_raster extension on PostreSQL 11.5 + PostGIS 2.5.3 + MacOS 10.14.6
There is a install script on https://postgis.net/install/.
All installations of extensions work fine, except ...
2
votes
1answer
75 views
PostGIS raster calculate average slope of 3x3 neighborhood around a geometry point
I have two tables
corners_final (vector point data)
dem_slope (1ft slope DEM, calculated in degrees)
With this simple query I am able to extract the slope value that intersects a given point
SELECT ...
0
votes
0answers
10 views
New raster derived from existing raster values in PostGIS
Using PostGIS I want to create a new raster, same size and dimensions as an existing one but with the values slightly adjusted from the existing one.
This seems so simple yet I have failed to find an ...
1
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0answers
45 views
raster2pgsql fail with JPEG encoded image
The problem
I have one JPEG encoded raster that works in GDAL and QGIS. The original file 05-D Braga.jpg is available online. The CRS is EPSG:20790.
To upload it to Postgis, I use:
raster2pgsql -s ...
1
vote
0answers
43 views
PostGIS Rasters not aligned even after calling ST_Resample() or ST_SnapToGrid()
I am trying to compute certain statistics from an elevation (DEM) raster column but at certain points the raster tiles are not aligned, and continue to not be aligned even though ST_SnapToGrid() or ...
0
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0answers
24 views
Permissions are blank when trying to load satellite images from Planet API
I am trying to download the map of Melbourne using Planet API. I have given AOI coordinates of Melbourne. When I run the code the permissions are returning blank ("_permissions": []). I cannot able to ...
1
vote
1answer
116 views
Importing raster data automatically to GeoServer
I'mtrying to make an automatic raster data import to GeoServer for later use in an OpenLayers web application in which i need to add raster files frequently, so I added Image Mosaic JDBC Plugin and ...
3
votes
1answer
86 views
Creating a raster with point count as cell value?
I have a PostGIS table with Point geometries in it. I want to create a raster object where each cell value is the number of points within a given raster cell. Cells with zero points in it can be 0, ...
1
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0answers
67 views
Storing raster imagery in PostgreSQL
I have a number of raster files saved locally which I use for basemapping in QGIS. I have built virtual raster fields to load these in one go but I'm looking to store them within my PostgreSQL ...
2
votes
0answers
41 views
How to insert raster and other columns using raster2pgsql?
I would like to have a table with a few more columns than just the raster data. Let's say I'd like to have anotherColumn.
I tried
raster2pgsql -s 3857 -R -a -k -f public.table.image -q -e -F -X ...
2
votes
1answer
67 views
return only one value per point from ST_Value() - currently returning 2 values for some points
I'm testing a point sample query with a subset of 5 points on a single band elevation raster. Using my usual approach (which I've previously not noticed this behavior), I get six records returned:
...
2
votes
1answer
127 views
How to use custom PostgreSQL schema with GeoServer ImageMosaic JDBC?
I have already created a raster layer in the postgres default 'public' schema and published it in GeoServer through the ImageMosaic JDBC. This is working fine but I would like to use a new custom ...
1
vote
1answer
26 views
Why does rescaling by 1.0 speed up this PostGIS query
To preface, I'm not sure if it matters, but I'm using PostgreSQL 11 with PostGIS 2.5 (through Docker on Windows) and accessing it with Python through PsycoPG2.
My raster has the recommended index on ...
1
vote
0answers
107 views
Query PostGIS raster table in QGIS
I would like to know if it is possible to query a PostGIS raster directly in QGIS in the same way one can use the query builder to filter a vector layer? I have successfully built database views of ...
0
votes
1answer
82 views
PostGIS ST_RECLASS using Lookup Table not working properly
Link to question/answer similar to what I am trying to do
I am trying to run ST_RECLASS on a raster to retain certain pixel values while setting others to NoData(0). I have a function that creates a ...
2
votes
0answers
119 views
Error Quantifying Land Cover Classes by Polygon in PostGIS
I am trying to ultimately calculate proportion of land cover types by polygon in PostGIS, so starting using st_valuecount to get counts of pixels with different land cover types. The data are pretty ...
3
votes
1answer
218 views
ST_Clip tiled raster using geometry results in out of geometry pixels
I'm trying to run an ST_Clip for a simple AOI geometry.
I'm using this WGS84 raster, imported into PostGIS like so:
raster2pgsql -t 100x100 -C -M -F -I -s 4326 Hansen_GFC-2016-v1.4_lossyear_20S_070W....
2
votes
0answers
91 views
Postgis ST_NearestValue() returns nothing
My query in (Dutch SRID, in meter):
SELECT ST_NearestValue(ahn.rast, 1, ST_SetSRID(ST_Point(135742.6965165309,453864.2795337387), 28992)
FROM ahn2.ahn
WHERE ST_Intersects(ahn.rast, ST_SetSRID(...
1
vote
0answers
266 views
GUI for raster uploads to PostGIS/PostgreSQL
We can currently upload raster data with raster2pgsql to our PostgreSQL db.
I am wondering if anyone is working on a GUI or plugin, maybe even through QGIS, that would make the raster upload ...
1
vote
2answers
281 views
Average of multiple rasters in PostGIS raster?
I am trying to calculate the average of multiple rasters stored as raster datatype in PostGIS enabled database. The rasters are stored in three different tables (spi3, sri3, and smdi) and have date as ...
1
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0answers
65 views
Stacking rasters of different resolutions in PostGIS
I have three rasters covering the same area but with different pixel sizes (Sentinel 2 tiles if it matters). My goal is to "stack" them, such that pixel[i,j] in the resulting raster contains [bands ...
1
vote
0answers
220 views
3d Intersect query compatible with GeoTIFF/DEM?
When researching this topic I haven't been able to verify if it's possible to make spatial 3D Intersect queries between a vector polygon with z-values and GeoTIFF/DEM file holding the elevation values?...
0
votes
1answer
203 views
PostGIS intersect query: Raster footprints of multiple high resolution GeoTIFF's or not? [closed]
I have multiple (381) high resolution GeoTIFF's (2x2 meter resolution, 1 band, 700 MB each) that I somehow want to upload to a PostGIS-server to be able to run ST_intersects or ST_3Dintersects queries ...
2
votes
0answers
105 views
Loading raster to R from PostgreSQL via pgGetRast takes a lot of time
I wrote R code in R Studio to load a raster (stored in PostgreSQL) to R. The database is stored here: C:\Program Files\PostgreSQL\
The following versions are installed on the computer:
R version 3.4....
1
vote
0answers
86 views
Using postgis to rasterize a set of points grouping by time
I have used postgis for vector operations for years, but have recently begun a project mixing vector and raster data and I am bit confused as to what is the best way to do what I want to do. I have ...
6
votes
0answers
364 views
PostGIS issue with ST_Clip?
I'm trying to clip a raster using a polygon but I end up with a result that doesn't seem right and where some raster pixels are outside the polygon used for the clip.
See image below where polygon is ...
1
vote
0answers
97 views
Sample overlapping rasters in PostGIS
UPDATE: The SQL below works fine. My problem was a newbie mistake in using the Python psycopg2 functions to execute it. So I think I should just delete this question.
ORIGINAL QUESTION: I have a ...
2
votes
1answer
177 views
How to write quotes in PG connection string in where clause when open Postgis Raster?
I have some rasters in PostGIS and I want to open just those which match to where clause. How can I do that? I have tried:
ds = gdal.Open("PG:host=<host> dbname=<dbname> table=<...
3
votes
1answer
178 views
Group raster data by values in a second raster
I am looking for a PostGIS equivalent to the ArcGIS Zonal Statistics by Table function.
I have two rasters. I would like to group the data in the second raster by the values in the first raster, and ...
4
votes
0answers
61 views
Why do I get a memory allocation error when selecting rasters by ID in PostGIS?
The Problem
I have about 256000 tiles in a table of GDEM v2 at 1 arcsecond resolution. I'm on an Ubuntu server running Postgres 9.5.5 and PostGIS 2.2. The table has a GIST index on the convex hull of ...
5
votes
2answers
496 views
Calculating Slope for the Whole World in PostGIS
The Challenge
I have a PostGIS Database which contains all of SRTM v4.1. I need to calculate slope for the entire globe as part of an error modeling process. The DEM is tiled at 100x100.
Whenever I ...
0
votes
1answer
197 views
Error while importing geotiff file into postgresql database in linux platform
I am trying to import GeoTIFF file into spatially enabled PostgreSQL database.
Using command:
raster2pgsql -s 4326 -C -F -a path/to/geotiff/file public.table_name
| psql -d database_name -U ...
7
votes
1answer
647 views
Set Z value to a linestring from a postgis raster
I have a table with multilinestring geometries that can be updated or inserted by external users, and a raster table with elevation values.
I want to write a trigger that sets the z value of each ...
1
vote
1answer
124 views
R Script for Computing Image Means and Raster Value Subtractions
I have a very specific script I am trying to make which computes image flatfields. Basically, I am computing a Master Dark Frame (MD) by averaging a set of Dark Photos.
I have a set of light photos ...
2
votes
1answer
415 views
Color of extent in OpenLayers 3
I'm very new to OpenLayers and all the GIS world.
I'm working with rasters (tiff that are converted to postgis sql)
I have this code:
var feature;
$.ajax({
method: "POST"...
1
vote
1answer
272 views
Why is pgraster much slower?
This is a follow up question to my other question: How to speed up raster/map algebra in PostGIS?
I am much attracted to the way how PostGIS handle vectors and rasters in an interoperable manner. A ...
1
vote
0answers
376 views
504 Gateway Timeout only with 1 kind of mapserver request (TileWMS in OpenLayers 3) [closed]
I'm very new to GIS. With MapServer, I'm calling four kinds of data, but only with this one am I having some HTTP 504 error message randomly. The other three never have that error, but only with this ...
1
vote
1answer
223 views
Can rasters in same CONSTRAINED table have different alignments in PostGIS?
Context
I have a table filled with ASTER GDEM data for the state of Colorado tiled at 100x100 pixels. I want to query the table and return a single raster that covers all of the supplied bounding box ...
3
votes
2answers
390 views
Rasterizing vector layer with PostGIS?
I have a vector layer with 2498 features (houses) that I want to rasterize/produce a raster image from but can't figure out how:
Column MARK_Z = is Meters above see-level for the base of each ...
0
votes
1answer
195 views
ST_Value, multiple rasters - need unique columns for rast values
I have a grid of cells that I am converting to centroids to 'sample' raster values in the same locations as the centroids. All rasters (4) are in the same table with same resolution and SRID.
I want ...
3
votes
1answer
276 views
PostGIS ST_AsPNG faster than ST_PixelAsCentroids
I'm hoping to export a PostGIS raster into a non-GIS enabled database. Ideally, I'd like to be able to have three columns in the output: latitude, longitude, raster_value. Easy enough.
Ideally, I'd ...
0
votes
1answer
150 views
postgis SRTM3 different raster scale in same column
SRTM3 elevation data are stored in HGT files each containing 1201x1201 values. I want to store this information in a PostGIS raster column with a single band.
To optimize my queries, I wanted to ...
6
votes
0answers
669 views
PostGIS: Storing large gridded time series
I'm trying to store a large raster timeseries on PostGIS-2.2 / PostgreSQL 9.5. The data comes as a collection of HDF-EOS (basically HDF4) files. Each file contains 24 bands, representing hourly ...
1
vote
1answer
277 views
PostGIS: ST_Clip problem with area which oversteps the raster
Hello all the PostGIS wizards!
I want to programmatically clip raster with bounding box which is overstepping the border of raster. Ok, i can do it with ST_Clip, but the problem is that ST_Clip only ...
1
vote
1answer
457 views
How to query with stored PostGIS time series raster data
I have time series raster data in PostGIS and I can't find a way to get the info as a time series from an XY point.
For example:
I would like to get the vale of the XY point in raster for the 13/08/...
1
vote
1answer
729 views
ST_AsRaster for polygon
Having a hard time to get a raster from a polygon
ST_AsRaster(ST_Buffer(ST_GeomFromText('POLYGON((-30 40, -20 30, -25 20, -23 10, -30 40))', 4326), 50),ARRAY['8BUI'],ARRAY[118]);
This line is giving ...
4
votes
0answers
247 views
Counting nodata and data pixels using PostGIS
I'm using PostgreSQL 9.2.4 and PostGIS 2.0.3.
I have some raster layer and I'm trying to get the count of all pixels (including nodata), cliped by polygon.
Raster was imported by raster2sql:
...
