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Katatunga edited this page Jun 26, 2020 · 12 revisions

Dependencies

Prerequisites

You need to have a Postgres Database set up with the extensions HSTORE and PostGis enabled. The data should have been generated by the OHDMConverter, because it needs to match the mapnik schema with columns 'valid_since' and 'valid_until' added to each table, filled with logical data.

Note: Data with null-values in either of those columns will be ignored in rendering.

Installation

1. Set up mapnik 2.3

Clone the repository of mapnik 2.3:

git clone -b 2.3.x https://github.com/mapnik/mapnik.git

1.1 Install mapnik

Follow the instructions on:
https://github.com/mapnik/mapnik/blob/2.3.x/INSTALL.md

We documented the issues we frequently encountered while setting up mapnik below (Known Issues).

2. Set up Preselected Rendering

Clone this repository:

git clone https://github.com/OpenHistoricalDataMap/Preselected-Rendering.git

2.1 Get world boundaries

mkdir Preselected-Rendering/world_boundaries
cd Preselected-Rendering/world_boundaries

2.1.1 Download the country borders and coastlines shapefiles

wget http://tile.openstreetmap.org/world_boundaries-spherical.tgz # (51M)
wget http://tile.openstreetmap.org/processed_p.tar.bz2 # (391M)
wget http://tile.openstreetmap.org/shoreline_300.tar.bz2 # (42M)
wget http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/cultural/ne_10m_populated_places.zip # (1.5 MB)
wget http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/110m/cultural/ne_110m_admin_0_boundary_lines_land.zip # (44 KB)

Note: It may be possible that the wget commands will result in an error. If that occurs, just download them manually via the provided links and move them into the world_boundaries directory.

2.1.2 Extract them into the repository

tar -xzf world_boundaries-spherical.tgz
tar -xjf processed_p.tar.bz2
tar -xjf shoreline_300.tar.bz2
unzip ne_10m_populated_places.zip
unzip ne_110m_admin_0_boundary_lines_land.zip

2.1.3 Clean up the archives

rm world_boundaries-spherical.tgz processed_p.tar.bz2 shoreline_300.tar.bz2 ne_10m_populated_places.zip ne_110m_admin_0_boundary_lines_land.zip

2.2 Install psycopg2

This is needed to access a postgres database.

pip install psycopg2

2.3 Customize Settings

You NEED TO customize the following file to match your database configuration.

inc/datasource-settings.xml.inc

You CAN customize the following file to change fontsettings for Mapnik fonts.

inc/fontset-settings.xml.inc

You CAN customize the following file to match your settings for symbols, the spatial reference of your postgis tables and coastline shapefiles directory. You SHOULD NOT however change the <!ENTITY prefix [...]>, because that entry is used by generate_view_tiles.py to access preselected database tables (Views).

inc/settings.xml.inc

You should stick with the recommended defaults unless you know better.

Testing rendering

To generate a simple image of the United Kingdom use the 'generate_image.py' script.

./generate_image.py # will output an 'image.png' file

Known issues

1. Set up mapnik 2.3: Error at './configure'

Exiting... the following required dependencies were not found:
- freetype-config (freetype-config program | try setting FREETYPE_CONFIG SCons option or configure with FREETYPE_LIBS & FREETYPE_INCLUDES)

See '/home/<user>/mapnik/config.log' for details on possible problems.

If you have Freetype installed, mapnik can't find its location. You can fix this by overwriting the location:

./configure FREETYPE_INCLUDES=/path/to/include FREETYPE_LIBS=/path/to/lib

(See also: https://github.com/mapnik/mapnik/issues/3211)

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