ALTO · Private research
Look at the photos, say what you see
The workbench is where invited people check spots on aerial photos and survey data, one question at a time. Each answer is saved as you give it, with where it came from, and the answers become maps and tables.
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Access is by invitation. If sign-in is refused, tell the person who invited you which address you used.
What it does
- A set is a list of spots to check: a tree crown, a gap in the canopy, a record to compare with the map.
- For each spot you see aerial photos from more than one year, and for some sets a height profile from airborne laser scanning (LiDAR).
- Answers come back as a spreadsheet (CSV) or a map file (GeoJSON) that opens in QGIS, ArcGIS or a group's own mapping system. ALTO uses them to check and train its maps of Auckland's trees.
How labelling works
- Open Checks and choose a set. Read "How to answer" once.
- Look at the photos, then press an answer, or its number key. It is saved straight away and the next spot appears.
- Can't tell is a good answer. A guess is not.
- Made a slip? "Undo the last answer", or go back with Previous. You can stop at any time and carry on later.
- When you are done, download your answers from the set.
Privacy
- Only invited accounts can sign in, and each person sees only the sets they were invited to.
- We keep your email address and your Google account ID, to check it is you. Each answer is stored with a short labeller code and the time; answers do not carry your email.
- Your answers stay with your group and the ALTO team at the Better Places Lab, University of Auckland, unless your group chooses to share them.
- The workbench sets one cookie, for sign-in. There is no advertising or tracking. Google's sign-in button loads from Google on this page.
Photos and data
Aerial photos and LiDAR: Toitū Te Whenua Land Information New Zealand, CC BY 4.0. Tree crowns: ALTO. Each set names its own sources.