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](/wiki/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! ## Exporting 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](/mapknitter-exporting). ## Activities [activities:mapknitter] **** ## Questions [questions:mapknitter] **** ### Advanced * [Decisions with distortions](!) - Learn about the design process of stitching maps when images are highly distorted or include tall buildings. This tutorial is in Photoshop, but the techniques are applicable to MapKnitter as well. * [Infrared multispectral compositing](/wiki/mapknitter-multispectral) (no video, in progress) Learn how to combine an infrared dataset with your map to assess photosynthesis. (Also: learn [how to collect infrared imagery](/tool/near-infrared-camera)) ...

Author Comment Last activity Moderation
Chukypedro "Any answer to the above question ..? " | Read more » almost 4 years ago
liz "Yes it would be super cool! Until then, try QGIS -- open source geographic information systems software that you can run ..." | Read more » over 4 years ago
warren "this was one of the uses! And yes, we are working (slowly) on that: On Tue, Jul 2, 2019 at 4:05..." | Read more » over 4 years ago
stevie "Hi @eymund I think I remember you were working on a project similar to this posted question a couple years back. Do you have any advice on it? " | Read more » almost 5 years ago
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molangmuir10 "Yes this is true. Is there not a way to draw polygons over overlapping images? Getting the annotations system running, with areas of any polygon d..." | Read more » almost 5 years ago
warren "Hi all! i was thinking about this in the context of MapKnitter -- i think we have a way to calculate area of a polygon, so for example a single ima..." | Read more » almost 5 years ago
molangmuir10 "Ah yes of course! I know you can do it in GIS but I don't have the software. This is a good way round it. And maybe this is a feature I will put in..." | Read more » almost 5 years ago
silentsairam "Hi @molangmuir10 :+1: It is quite tough to measure Area of land from Aerial photos I guess as the Area is calculated based on the distance between..." | Read more » almost 5 years ago