Public Lab Wiki documentation


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Support Public Lab Today!

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. will go offline August 15, 2022.

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.

We are doing our best to sustain programming and support for our community, and we need your help. Thank you for being part of our community. We can't wait to be back online with you.

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