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In a database, a mechanism for optimizing access to data based on the spatial column(s) of a data table.

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I have a cloud hosted Microsoft SQL Server 2019. I have a table with 77 columns and one of them is of geography type called Geo. The table has around 431K rows. Of these, 390K have a NULL Geo, 18K are ...
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I'm trying to improve the query below. My goal is to select all lines from time_lines that are intersecting the boundary of time_subdivided_polygon and are within polygons of berlin_2024_ale. The ...
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The PostGIS guide say that we must to use a GIST index, and the PostgreSQL guide say that we can use a WHERE predicate: CREATE INDEX mytable_geom_idx ON t USING GIST (geom) WHERE predicate; But the ...
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I've used H3 in the past just for speeding up my spatial queries, however I'm looking for the best way to store the index information itself alongside my data. Something like: CREATE COLUMN H3res14 --&...
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Here is my query: explain analyze with pings as ( -- ================= SELECTING JOINED data with join conditions -- ================= -- ================= -- ================= -- ================= -- ...
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I have a general question about geopandas overlay method. I want to know whether it already uses spatial indexing or not. If not, how would I apply indexing? Background I do an intersection with ...
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I am wondering if QgsSpatialIndex() does support Z values, respectively 3D distances? If too short to read: Looking at the underlying libspatialindex I cannot find information neither. However, rtree ...
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(Background: I'm more of a MySQL guy, I've only been using PostGIS for a few months to solve this particular problem set.) I have a table that contains a point and a radius: id | location ...
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I have a GPKG file, example.gpkg, with 2 layers, base and circles. There is only 1 geometry in base, and there is a large number of geometries in circles. I would like to select all the geometries in ...
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I have a GPKG file, with 2 layers, p and q. I would like to create a third layer, r. I would like r to contain those parts of p which do not intersect with q. We could phrase this as r=p-q. Below is a ...
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I have a table where each row has a point Geometry(POINT(...)) [long lat]. These geometries don't specify an srid. Which means we're using a cartesian plane to do the calculations. All of this data is ...
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I have a question about spatial indexes. I'm using SQLite with VirtualSpatialIndex. I have a main table that contains millions of polygons. Let's say every 4 months I have to get a completely new ...
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I am looking for high performant database that support spatial-temporal index. It would be ideal if spacial part of it indexed based on S2 geo library.
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It was possible in previous QGIS version but since a while, if i add Create a spatial index in the modeler i get a warning : L'algorithme “Créer un index spatial” ne peut pas être exécuté dans un ...
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Here are the relevant CTE's from my query: campaign_ping as ( select * from campaign_pings cp left join campaign_pings_validity cpv on cp."ID" = cpv."pingID" where cpv."...
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Here is a snippet from my code: ST_DWithin(c.convex_hull::geography , cp."geoJson"::geography, 20) Please note both "convex_hull" and "geoJson" are geometry columns (...
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I would like to store bounding boxes in a column of my table. Thus I wanted to use the box2d data-type for that column. However it seems like I can't create an index on that column. Here is my ...
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I have 2 data frames with routes and linestrings: df1 = { "Route": ["AL013-AL015", "AL013-AL014", "AL013-AL011"], "Linestring": ["LINESTRING (...
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I'm just starting to learn MySQL and I have a script that loads a large CSV file (4 million rows) into a table and then adds a spatial index to the GeometryLatLon column. The spatial index creation ...
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I have a list of 63 rasters. They are the same extent, resolution, projection, etc. Because I extended 62 rasters to the maximum extent of the 63rd, I introduced NA values. However, these are relative ...
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I am trying to compute soil moisture index using Landsat 8 collection 1 level 1, but it seems that I am not computing it properly. My range is not 0 to 1, as it should. Values of my variables can be ...
Chris's user avatar
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I want to write a GeoPackage file with GeoTools and create a spatial index in the end. After consulting the documentation and also the implementation I still can not figure out a way to do this using ...
evod's user avatar
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As my data sets are very large I’ve been unable to compute anything in R. I’ve been successful doing things manually in ArcGIS Pro. Now I’m attempting to calculate the Shannon diversity index for ...
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I have a JSONB column with an array of locations. I want to do a Postgis GiST index on each of the array items. For example: [{ "location":{ "type": "Point", ...
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It is easy to save a GeoPandas dataframe to a PostGIS database using the gdf.to_postgis(...) command. But, it is not clear to me if it automatically generates spatial indices or if these need to be ...
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I have created 2 databases. First one has PGSnapshot Schema which looks like this. On this I fire query select id,ST_AsText(geom) from nodes where ST_Intersects(geom , ST_GeomFromText('POLYGON ((-125....
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I am trying to write a custom processing tool for QGIS which joins the nearest attributes with some conditions. Therefore I'd like to use a QgsSpatialIndex to increase performance. This works ...
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SDE.ST_GEOMETRY — Oracle 18c — ArcMap/EGDB 10.7.1: I have a view that returns the startpoint of lines as an ST_GEOMETRY column: create or replace view bc_atn_startpoint_vw as ( select objectid, ...
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I am quite familiar how to work with the Toblerity RTree library: import fiona import rtree with fiona.open(input_path,'r') as source: p = rtree.index.Property() p.filename = "index....
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I am trying to understand about how R-tree works for polygon data. In other words, polygon is a list of vertices (points), however, I am wondering how spatial index can recognize the order of points ...
Masoumeh's user avatar
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I got a giant geometry that I retrieve from an API and I break it into smaller pieces with ST_Subdivide. Right after, I'm inserting it into a temporary table (which is indexed and only contains a ...
Bil11's user avatar
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I'm trying to generate a Shadow Index using the maximum values from a image composite (ImageCollection). Here is the link with the code: https://code.earthengine.google.com/...
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I've run into a performance problem from which I'm not sure how to move forward. I have a table with ~150M rows. And I have a query that in EXPLAIN has a cost of just cost=0.55..209.36, but in EXPLAIN ...
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I am trying to find the index (x and y pixel position in an image) of a pixel (ex: the pixel with max DN value). however, it has been challenging for me. My code is: var geometry3 = ee.Geometry....
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I an deleting one of the intersecting polygons from a vector layer using PyQGIS code mentioned below. It is too slow as I have many features in the layer. Is there a way to speed it up? index= ...
vigna purohit's user avatar
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I want to make NDBI indices to a certain location. But when I run the code it can only show part of it //####################### Import SHP ####################### var countries = Indonesia //Import ...
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I want to process data with a model in QGIS. It works fine, but the bigger the datasets get, the longer it takes. The reason is, I use GeoJSON layers and they don't have a spatial index. That is why I ...
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I am working with the GeoNames database which has around 10 million rows of locations including longitude and latitude. I have tested around 6 various nearby location queries including spatial indexes....
Ryan NZ's user avatar
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Is it possible to share rtree index in memory with multiple processes? I have succeeded to use rtree in multiprocessing environment with joblib, but the problem is that each process has its own copy ...
r0x0r's user avatar
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I have been reading this blog by Paul Ramsey, and considering my own data. https://blog.crunchydata.com/blog/the-many-spatial-indexes-of-postgis I have a regular grid covering an area of the world. ...
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So I read in a .tif image with rasterio and what I get out when printing dataset.read(1) is what I understood a coordinate system in the "red" band of the image. The coordinate system is in ...
Oliver's user avatar
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I'm trying to calculate Index‐Based Built‐up Index (IBI). This index has been mentioned in A new index for delineating built‐up land features in satellite imagery. As mentioned in the paper, the range ...
Badal's user avatar
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I am encountering a weird behaviour in QGIS 3.20 on Windows. Steps to reproduce: Create an empty project Create a SHP layer. Add a few features. Save the changes to disk At this point everything is ...
peauc's user avatar
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I have such vanilla index on a PostGIS table: CREATE INDEX polygons_gix ON public.polygons USING gist (geom); Because of this: If using more than one transformation, it is useful to have a ...
swiss_knight's user avatar
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Context I have a massive MultiPolygon (~90'000 vertices, super complex, spreading over 60km², with lots of holes and parts) resulting of some Python computation. This MultiPolygon is coming as a WKT ...
swiss_knight's user avatar
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I'm trying to learn how to write geopackage SQL queries so that the r tree index is used, but I can't seem to find any good information. I'm just trying to write a simple query in the qgis db manager ...
Alex's user avatar
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Creating a spatial index on a geometry field is very important. The docs also state that you should perform a VACUUM ANALYZE after large update operations. But is it ever necessary to drop an existing ...
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I am trying to calculate BAIS2 index for sentinel-2 collection over a study area in Google Earth Engine. I tried to create a function using expression but end result is binary image rather than index ...
Monish's user avatar
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I'm working with a time series stack of 28 raster bands. Each band is an image for a specific date, spanning all of the year 2020, and they are stacked in order. The stack (change_point_raster) is in ...
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I have about 1.5 billion points in a geography column which represent topography. I'll be retrieving all the points that are within a certain distance of a given long/lat. I was able to create a GIST ...
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