fieldpapers/fp-printer

Name: fp-printer

Owner: Field Papers

Description: Field Papers printing

Created: 2015-02-27 02:36:41.0

Updated: 2017-11-15 19:13:00.0

Pushed: 2015-02-27 03:15:55.0

Homepage: null

Size: 95

Language: HTML

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README

Field Papers Printer

This repository contains (or will) Field Papers' atlas creation pipeline.

This pipeline involves outputting an atlas-specific HTML page containing page breaks (as appropriate), intended for output as a PDF using wktopdf.

Installation

Install wkhtmltopdf. The OS X installer unfortunate side-effect of resetting permissions on some folders within /usr/local (if you're using Homebrew).

Printing

To create a PDF:

mltopdf http://host/path atlas.pdf

By default, this will produce A4-sized portrait output. To change the orientation, use -O Landscape. To change the paper size, use -s Letter (etc.).

High Resolution Map Output

Standard images for the web are 72dpi. Retina images (@2x) are twice that, at 144dpi. Since we're generating output intended for print, we'd like to get to 300dpi if possible. Using standard tiles, we can offset by 2 zoom levels and shrink the effective image size to 64px (substantially shrinking the size of features and text). This can be done in Leaflet like so:

leLayer("http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png", {
leSize: 64,
omOffset: 2
ddTo(map);

Retina tiles (512x512px) can target the same resolution and only offset by a single zoom:

leLayer("http://{s}.tile.stamen.com/toner-lite/{z}/{x}/{y}@2x.png", {
leSize: 128,
omOffset: 1
ddTo(map);