Tagged Questions

SpatiaLite is a spatial extension to SQLite, providing vector geodatabase functionality.

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1
vote
1answer
301 views

Mapnik - Weird tiles rendering when used with spatialite

I use Mapnik in an GeoDjango App with Spatialite 4.0 as backend. There is something weird with the tiles that I suspect might be related with a bad handling of mbr with spatialite. If you look at ...
1
vote
1answer
313 views

How to save a joined spatialite table when each table contains PKUID fields?

QGIS 1.8.0 -- QSpatialite 6.0.7 -- Windows XP I have spatialite tables joined together that I need to save as a single table, but an error-message says that QGIS can't save the table because there ...
0
votes
1answer
94 views

Error on rendering linestring

I am using Mapnik 2.0.1rc0 on a Windows 7 with python 2.7 32bits inside a GeoDjango App using xml. The datasource come from spatialite 4.0. My tiling script can render polygon and point features ...
0
votes
0answers
206 views

mapnik error - fatal flex scanner internal error--end of buffer missed

I am using Mapnik 2.0.1rc0 on a Windows 7 with python 2.7 32bits inside a GeoDjango App. I often got this error: fatal flex scanner internal error--end of buffer missed that makes python to crash ...
0
votes
1answer
237 views

Using the API of QSpatiaLite plugin

I am using the popular QSpatiaLite plugin for QGIS. Since I am creating and modifying SpatiaLite tables directly with Python (using pyspatialite), I wonder whether I can automate tasks such as ...
2
votes
1answer
602 views

How to build Android spatialite?

I have been trying to build spatialite for Android for a few days now without success. I have even tried the recent documentation from the Google project page here: ...
1
vote
0answers
102 views

About spatialite views and Attribute table

I try to use views with spatial column in spatialite. I can connect to spatialite database and load the layer without problems but when I try to view data in Attribute Table I can't get eny data; all ...
5
votes
4answers
3k views

How to convert multipoint layer to point

I have a Spatialite layer which is multipoint (following a QGIS Save As from shapefile). I need it to be PostGIS and POINT. I have tried ogr2ogr -nlt POINT and got 'new row for relation "xxx" violates ...
0
votes
1answer
180 views

GeoDjango - DatabaseError: no such table: spatial_ref_sys with Spatialite

Im going through the GeoDjango Tutorial. I have loaded the WorldBorders shapefile into Spatialite. I can do spatial queries such contains, intersects, but I have a DatabaseError: no such table: ...
1
vote
1answer
343 views

How can a HTML table be stored within a database field as a BLOB, text or other value?

My Spatialite database has several thousand spatial polygon records In QGIS, each with a couple dozen field values. I also have many thousands more of additional tabular data relevant to those ...
2
votes
2answers
123 views

Spatialite as a DBMS-server with GeoDjango?

I would like to add a spatial component to my Django application. I turned out to GeoDjango immediatly. I am wondering now if spatialite could be used as DBMS-server for an application in Prod. Grosso ...
3
votes
0answers
99 views

Can layers from Spatialite db be used as input for a Sextante model?

I'm trying to build my first models in SEXTANTE and already fail at the start. It seems not to be possible to add a vector layer which derives from a database. Orginally, the layers are from a .mdb. I ...
1
vote
3answers
180 views

Copying schema of Postgis or Spatialite DB to blank one

I want to copy a Postgis or Spatialite DB sctructure (features, tables) to a blank DB. In ArcGIS i can easily handle it by using XML Workspace Document. Fisrtly extact it from a Geodatabase and than ...
1
vote
2answers
61 views

Seek assistance with: SQL Server 2008 Query that takes values from a column in another table (or from a flat file)

I am given a list in MS Excel of 554 statistical units (called Primary Sampling Units or PSUs) from another department and have to query all 554 PSUs from a SQL Server 2008 Spatial database table ...
2
votes
0answers
66 views

QSpatiaLite: Cannot create table

I am running QGIS 1.8 (SpatiaLite 3.0.1) and QSpatiaLite 6.0.1. I have a spatial table EventPrecise (with geometry column p in EPSG:4326). I want to join this table with another, non-spatial table ...
3
votes
0answers
93 views

QGIS Workflow Problem [closed]

I have 3 SpatiaLite layers (one without geometry but with fields that need to be filtered, one with points and one with polygons, both without any non-geometry fields) that need to be combined to a ...
2
votes
2answers
952 views

Can't open Spatialite db from openstreetmap in Quantum GIS

I am new to QGIS, OpenStreetmap and Spatialite. I'm trying to get the (OSM) map data into a (SQLite) compact form I can eventually use for realtime reverse geocoding in a vehicle. Quantum is just for ...
3
votes
1answer
227 views

Why is my Polygon (WGS84) in SpatiaLite 4 not displayed by QGIS? [closed]

I made a polygon in a SpatiaLite 4 database as follows: INSERT INTO test_pg (id, name, geom) VALUES (3, 'test', ST_PolyFromText('POLYGON((8.556824 47.185269, 8.611009 47.185269, 8.611009 47.218568, ...
2
votes
3answers
705 views

Ogr2Ogr SQLite Geometry Functions

I believe title is all clear.I'm using Ogr2ogr utilities & binaries to read geometry. I used something like this: ogr2ogr -f "SQLite" test2.sqlite test.sqlite -sql "SELECT ...
2
votes
1answer
187 views

How to compile QGIS from source with custom pyspatialite 4.0.0?

I have turned WITH_PYSPATIALITE ON, but I have a custom build of SpatiaLite (4.0.0), not the packaged version, so I set WITH_INTERNAL_SPATIALITE to OFF. How do I tell QGIS to configure PYSPATIALITE ...
2
votes
1answer
408 views

Open source software for car navigation on iOS platform

I'm trying to make a car offline navigation app for iOS. Now I analyze OpenStreetMap features what to use. I would like to know if there is open source solution for the following parts of app: best ...
4
votes
2answers
372 views

How do I reduce the number of drawn polygons on an Android Map?

We're using spatialite-android and Nutiteq to render Archaeological datasets. One of our sample data sets has 7000 polygons that turn into 400,000 objects in our renderer. Is there a common GIS ...
1
vote
1answer
258 views

How to compile liblwgeom independently?

For using liblwgeom function in spatialite, I need to compile the library. I found that it is included in the PostGIS code. My question is, how to compile the library without compiling the whole ...
2
votes
1answer
372 views

In what situations would SpatiaLite be selected over PostGIS, and vice versa?

I know that SpatiaLite is a lightweight solution. Would it be a problem if I put it on a 5K pageview/day site? Is PostGIS too resources-consuming for such usage? The dataset is something like < ...
0
votes
1answer
71 views

QSpatiaLite query syntax

Using the QSpatiaLite plugin in QGIS I composed the following query SELECT 'AddressPoint_2'.'buildingNu', 'AddressPoint_2'.'postCode' WHERE 'AddressPoint_2'.'postCode' = 'NR13 3AA' FROM ...
1
vote
1answer
100 views

Python error when running SpatiaLite with OSGB(27700)

I have a project open in QGIS and am trying to import an Ordnance Survey Address Point layer into SpatiaLite. I have recently installed the Qspatialite plugin. I open SpatiaLite in the DB Manager ...
3
votes
2answers
655 views

Can I import a .gml file into Spatialite in QGIS?

I have some Ordnance Survey Address Base data files which have a .gml extension. I have imported them to GGIS as vector layers along with some mapping data but would like to explore them with ...
5
votes
1answer
176 views

Where is the Spatial reference ID stored in SpatiaLite?

I have loaded a shapefile into a SpatiaLite Database using the spatialite-gui. In which table is the Spatial reference ID or EPSG code (of the stored data)stored in SpatiaLite?
3
votes
1answer
135 views

ST_Touches function in Spatialite

I'm a newbie to Spatialite so forgive me if the answer to my question is obvious...(I tried looking online but couldn't find the answer to this question). I am trying to use the function ST_touches in ...
6
votes
1answer
181 views

Finding all neighbors for all polygons in Spatialite

Excuse me if this is a basic question but I'm new to Spatialite... I have a dataset with zip code polygons and I would like to create a list where for each zip code we have listed all the neighboring ...
1
vote
0answers
43 views

spatialite sql and possibly using case

i have a database that has got tables with images and some of the tiles for the images is repeated and i want to eliminate the duplicates based on which imagery is oldest so as to remain with the ...
0
votes
2answers
198 views

Can I incorporate an existing DBF file with coordinates for Tiff tiles into geodatabase like spatialite?

I have 285 Tiff files that make up the 1:10000 OS map of Norhtern Ireland. I am having problems running QGIS when I try to load all 285 tiff files in for base maps (I think the memory on computer is ...
4
votes
1answer
346 views

How to add a geometry to an existing feature that was created with NULL geometry?

I have a simple SpatiaLite geodb loaded in QGIS with one table. There is a POINT geometry field and some alphanumeric data. In some cases I can record data about a specific site, but the coordinates ...
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 ...
4
votes
1answer
782 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 ...
3
votes
1answer
411 views

Why does AddGeometryColumn error using the libspatialite-2 DLL with pysqlite2?

What I'm trying to achieve is to create a geometry column of a point based on the latitude and longitude of that particular row in the already created table. Given the following code: ...
10
votes
2answers
772 views

What is an “XYZM” measurement model?

SpatiaLite supports a remarkable number of different dimension models. Interestingly, some of their values support a "measure" coordinate (XYM, XYZM). How would this measure-coordinate be used, and ...
6
votes
2answers
337 views

Why is this spatialite polygon layer not displayed properly?

In QGIS, I have a spatialite multipolygon layer that have full objects in attribute table but do not display random ones as I scroll and pan around: Vietnam map at zoom level 1:16000000 - some ...
4
votes
1answer
137 views

Is it possible to have a single foreign key column referenced to two or more different tables?

In Spatialite (3.0.1), having a normal (non-spatial) table, I would like to relate it to two different spatial tables, with different geometries types (multipolygons and polylines), using the same ...
5
votes
1answer
613 views

What is the efficient way to dissolve polygons using Spatialite 3.0

I have polygon table called "tableA" with 72000 records. It has a geometry column called "geometry", and a text column called "field1". I want to aggregate\dissolve all polygons with the same ...
8
votes
3answers
2k views

Is Spatialite Really Slow?

I have a couple of thousand polygons in SpatiaLite. I am trying to do a "touches" query: select map1.* from map1,map2 where touches(map1."Geometry",map2."Geometry") and wow, is it SLOW! ...
0
votes
1answer
305 views

Problem in Spatialite database creation

When I try create a new DataBase, Spatialite plugin return the dialog error box: The SQL query seems to be invalid. no suck table: views_goemetry_columns When I click in OK button, a second dialog ...
0
votes
1answer
151 views

qspatialite error compiling Qgis 1.8 (linux debian squeeze)

I tried to compile Qgis 1.8 in linux debian squeeze (following the instructions in INSTALL.txt). During 'make' I get the following error: [ 40%] Building CXX object ...
9
votes
5answers
1k views

How to build a geographic database of GPS logs?

On our aerial wildlife surveys we typically generate dozens of GPX files, and usually convert most of them into shapefiles for display in a GIS application. GPX files are a terrific way of keeping all ...
3
votes
1answer
355 views

How to open a Spatialite non-spatial view in QGIS

I'm using Qgis 1.8.0, and spatialite 2.3 in a Windows Vista machine. I have a database in Spatialite, and I have created a view from one of its tables. When I open it in QGIS, using add Spatialite ...
4
votes
2answers
348 views

Is it possible to add a new line in a non-spatial table using Qgis?

While using QGIS, and having loaded a non spatial table (from a dbf or a Spatialite table), is it possible to add a new row to its table attributes? Normally in a spatial layer you have to use "add ...
4
votes
2answers
1k views

How do I split polygons into line segments?

How can I split my polygon file into "segements"? The lines should be broken up like this picture shows:
7
votes
3answers
3k views

How to create a new Spatialite database in QGIS

I've been trying to create a new spatialite database within QGIS 1.8 (SpatiaLite Version 3.0.1; QSpatialite 6.0.3) and keep getting this error: "The SQL query seems to be invalid. no such table: ...
0
votes
1answer
305 views

python qgis.core import error caused by spatialite libraries

I have an error when trying to import qgis.core to python: >>> import qgis.core Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: ...
2
votes
1answer
523 views

OSM data, line and polygon confusion

Taking some OSM (*.osm) data downloaded from Geofabrik I have created a Spatialite database using spatialite_osm_map. Now I have problems, because some of the data that is supposed to be in the form ...