Public Lab Wiki documentation


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The MapKnitter platform runs on a combination of volunteer and paid labor by the many people that build, maintain, and operate it via Public Lab. This is an effective combination thanks to the culture of Public Lab's Coding Community. Public Lab's web ecosystem, including,,, and associated projects, takes 20 hours a week from three Code Coordinators and our sysadmin. While cost effective, it is not free. Web hosting and server costs for MapKnitter are approximately $1000 per month. For the last twelve years, Public Lab has hosted so that people everywhere can make maps from their aerial photos. Unfortunately, current circumstances have led us to scale back and take certain services offline. We are doing our best to sustain programming and support for our community. And we need your help. (Support Public Lab today making a donation today.)[]

Part of the Grassroots Mapping Curriculum series.

MapKnitter is a free and open source tool for combining aerial images into a map, or composite image. Informally, we call this "stitching a map" and it's useful if you have many images of overlapping or identical areas, and getting either a web map or a printable map from your photos.

MapKnitter can make maps from any image source, but it was designed for making maps with aerial photos from balloons and kites.

Start using or read on for more documentation!


Once you're map is complete, you can download it as a single image in JPG and other formats. Read about the new Cloud exporter here:

Learn more about exporting maps in MapKnitter here.


Activities should include a materials list, costs and a step-by-step guide to construction with photos. Learn what makes a good activity here.


Title Author Updated Likes Comments
Is there a file size limit to the image that can be uploaded? @calmstrong almost 2 years ago 0
Intermittent issues logging into MapKnitter @warren over 2 years ago 0
mapknitter, downloading, exporting @pataxte about 4 years ago 2
How to save and return to a map, and uploaded images in Mapknitter @pataxte over 4 years ago 3
MapKnitter map of Garbage Hot spots @silentsairam over 4 years ago 1
Can geotagged aerial images be automatically placed in the right location on the map according to their coordinates? @se18023 over 4 years ago 6
Mini video recorder @Ag8n over 5 years ago 4
Geotiff error when trying to export @Zemans over 5 years ago 9
How to choose the order of pictures when exporting @adyr_construction almost 6 years ago 4
How do i overlay a north to south aerial image on a digital map? @yuvalsh almost 6 years ago 4
Is there an offline version of Mapknitter? @stevie about 6 years ago 1
Problem with rotating the image @narendradesilva over 6 years ago 2
User Interface on Mac @mlapey over 6 years ago 2
please help! @ROCKETMAN almost 7 years ago 1
how do i get my old map @jgee7 almost 7 years ago 0