If you installed PostgreSQL locally on your computer, you may find that shp2pgsql has been installed along with it, and it is available in the executable directory of your installation. Unlike ogr2ogr , shp2pgsql does not connect directly to the destination database, it just emits the SQL equivalent to the input shape file. The executable program! It reads the source data file, and emits SQL which can be directed to a file or piped to psql to load directly into the database.
The I flag tells the program to create a spatial index on the table after loading is complete. The utility program is generating a stream of SQL. The arguments to psql are just the connection string for the destination database. An SRID is convenient because it packs all the information about a map projection which can be quite complex into a single number.
You can see the definition of our workshop map projection by looking it up either in an online database,. In both cases, you see a textual representation of the spatial reference system pretty-printed here for clarity :. You can view a number of data formats including flat shapefiles and a PostGIS database. Its graphical interface allows for easy exploration of your data, as well as simple testing and fast styling. Try using this software to connect your PostGIS database.
MacOS : If you installed Postgres. In order for external programs to insert and retrieve useful geometries, they need to be converted into a format that other applications can understand. Fortunately, PostGIS supports emitting and consuming geometries in a large number of formats:. Well-known text WKT. Well-known binary WKB. The most common use of a constructor is to turn a text representation of a geometry into an internal representation:.
Note that in addition to a text parameter with a geometry representation, we also have a numeric parameter providing the SRID of the geometry. However, most actual processes, such as viewing data in a GIS application, transferring data to a web service, or processing data remotely, WKB is the format of choice. Note that the text representation changes! This is because the text input routine for PostGIS is liberal in what it consumes. It will consume. PostgreSQL includes a short form syntax that allows data to be converted from one type to another, the casting syntax, oldata::newtype.
So for example, this SQL converts a double into a text string. Several variants. Return NULL if the geometry is not a polygon. Otherwise, return NULL. Values are: 2,3 or 4. Polygon, Multipolygon. Input must be a point. Note Do some or all of your nyc tables not have an srid of ? Also make sure to enable the drivers you want to use as described in Section 3. A PostgreSQL configuration variable postgis. In order to build the Section 4.
Regex::Assemble perl CPAN package is only needed if you want to rebuild the data encoded in parseaddress-stcities. Section 4. Also, pkg-config is required to verify the correct minimum version of protobuf-c.
See protobuf-c. To disable this and use GEOS instead use the --without-wagyu during the configure step. CUnit CUnit. This is needed for regression testing. DocBook xsltproc is required for building the documentation.
ImageMagick convert is required to generate the images used in the documentation. As with most linux installations, the first step is to generate the Makefile that will be used to build the source code. This is done by running the shell script. With no additional parameters, this command will attempt to automatically locate the required components and libraries needed to build the PostGIS source code on your system.
Although this is the most common usage of. The following list shows only the most commonly used parameters. Starting with PostGIS 3. This means all PostGIS 3 libs will end in postgis To get the old behavior of file including the minor version: e. This is the location the PostGIS loader executables and shared libs will be installed.
By default, this location is the same as the detected PostgreSQL installation. This parameter is currently broken, as the package will only install into the PostgreSQL installation directory. GDAL, a required library, provides functionality needed for raster support gdal-config to enable software installations to locate the GDAL installation directory.
GEOS, a required geometry library, provides a utility called geos-config to enable software installations to locate the GEOS installation directory. It normally is found if you have libxml installed, but if not or you want a specific version used, you'll need to point PostGIS at a specific xml2-config confi file to enable software installations to locate the LibXML installation directory.
Proj4 is a reprojection library required by PostGIS. This will create shp2pgsql-gui graphical interface to shp2pgsql. Disable topology support. There is no corresponding library as all logic needed for topology is in postgis By default PostGIS will try to detect gettext support and compile with it, however if you run into incompatibility issues that cause breakage of loader, you can disable it entirely with this command.
NOTE: that you aren't missing much by turning this off. By default PostGIS will not install with sfcgal support without this switch. With this optional argument you can disable using this library; GEOS will be used instead. If you obtained PostGIS from the code repository , the first step is really to run the script. This script will generate the configure script that in turn is used to customize the installation of PostGIS. If you instead obtained PostGIS as a tarball, running.
The last line of the output should be " PostGIS was built successfully. Ready to install. As of PostGIS v1. If you wish to install these comments into your spatial databases later, run the command which requires docbook. Introduced in PostGIS 2. This generates html cheat sheets suitable for quick reference or for student handouts. If you are building from source repository, you need to build the function descriptions first. These get built if you have docbook installed.
You can also manually build with the statement:. Building the comments is not necessary if you are building from a release tar ball since these are packaged pre-built with the tar ball already. The extensions should automatically build as part of the make install process. You can if needed build from the extensions folders or copy files if you need them on a different server. Refer to psql environment variables.
These are the control files that denote information such as the version of the extension to install if not specified.
If you get no records back, it means you don't have postgis extensions installed on the server at all. PgAdmin III 1. If you have the extensions available, you can install postgis extension in your database of choice by either using pgAdmin extension interface or running these sql commands:. In psql you can use to see what versions you have installed and also what schema they are installed.
As of PostGIS 2. Put in a ticket if you find an issue. These behaviors are built into the current PostgreSQL extension model, so nothing we can do about it. If you installed 3.
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