To-fix for overlapping and crossing buildings in Zimbabwe

[kupendrayadav]

As part of Malaria elimination campaign under Clinton Health Access Initiative, a lot of community members and new mappers are contributing towards mapping buildings in the Zimbabwe from past few months. We gave our total support through validating tasks in Zambia and mapping in Zimbabwe. You can go through #274 for detailed context

Due to sharing same task boundaries and few newbie errors, we observed a 10,034 overlapping and crossing building issues in Zimbabwe. We created a To-fix task for the overlapping and crossing buildings in Zimbabwe.

Points to remember:

• Whenever you find duplicate buildings mapped, better to keep building mapped according to Digital globe imagery as it is the latest and updated imagery.

• It’s also fine to keep buildings which are in Bing imagery, even though they are not in DG imagery.

  It would be great If we complete this project before deadline i.e June 3rd week. @kupendrayadav and @luiswalter coordinate with their respective teams and will post the progress of the project daily.

To-fix link: https://osmlab.github.io/to-fix/#/task/crossingbuildinginzimbabwe

Digital globe Imagery: tms:https://api.mapbox.com/v4/digitalglobe.2lnp1jee/{z}/{x}/{y}.png?access_token=pk.eyJ1IjoiZGlnaXRhbGdsb2JlIiwiYSI6ImNpd3A2OTAwODAwNGUyenFuNTkyZjRkeWsifQ.Y44JcpYP9gXsZD3p5KBZbA

cc @mikelmaron @maning @Rub21 @luiswalter

[mikelmaron]

@kupendrayadav TY. @luiswalter @Rub21 let's keep track of daily progress by both teams on this ticket

@kupendrayadav -- is the Bing imagery more recent than DG? that's what I gather from your bullets above

[kupendrayadav]

@mikelmaron No, DigitalGlobe is latest and updated imagery than Bing. I will update the point now.

[luiswalter]

@kupendrayadav - The task can be advanced much faster if we solve the errors together and not only in the only error that the tofix shows.

For this it is necessary to use the JOSM validator to locate errors faster.

[luiswalter]

Yesterday we worked on this task, We spent 1 hour working @piligab and me.

how do we work?

We used JOSM + to-fix plugin. and then we fixed the highlighted errors and also the errors near it, We solved around 2k issues.

Today we run again osmlint and updated the task https://osmlab.github.io/to-fix/#/task/crossingbuildinginzimbabwe, osmlint detected 8,189 issues. @kupendrayadav @mikelmaron

Before

After

[kupendrayadav]

Great Work @piligab @luiswalter 👏 Yesterday two people in Bangalore worked on the to-fix task for one hour. We reviewed nearly 180 issues in the task. I had chat with @Rub21 on stats page as it is not reflecting my progress. It will be fixed soon.

Questions:

• We observed people mapping buildings using both imageries and buildings are overlapping each other. In this case which building should be deleted?

• Even though DG imagery is good to map, they mapped buildings according to Bing which is not aligning to the DG imagery. Can we consider, if people map according to Bing? It would be great if we have one standard imagery to follow.

• We noticed some buildings which are present in Bing, but not in DG. As DG is latest and updated, Does that mean those buildings are demolished? Should we delete them or not?

• Here are some examples where people mapping buildings using both imageries.

@mikelmaron @maning @luiswalter

[russdeffner]

Bing should be used for alignment when GPS is not available. In most cases DG is newer, so if building are showing in Bing but not DG then they probably are gone, I usually inspect the trees and roads for which imagery is newer; if it's not obvious that Bing is newer, assume DG is.

[luiswalter]

• The buildings on top of each other, will always exist in HOT tasks. In the validation work we take into account the best edited building and that it is calibrated with the DG image.

• Consider removing buildings that are drawn with Bing and not with DG, I do not know, the work we are doing is more validation in building crossings, that is why in ayacucho we do not erase buildings (only if necessary). I think @mikelmaron would answer this question better.

@kupendrayadav

[mikelmaron]

the work we are doing is more validation in building crossings, that is why in ayacucho we do not erase buildings

agree @luiswalter that the focus is on building crossings. however, if you noticed in passing an obvious building removal issues -- why not go ahead and remove?

[luiswalter]

@mikelmaron Of course, yes, they can be eliminated under some characteristics like:

• buildings that do not make sense and are on other buildings.
• Buildings that are a replica of another.
• Buildings that have no relationship with the DG or Bing Imagen

[kupendrayadav]

buildings that do not make sense and are on other buildings. Buildings that are a replica of another. Buildings that have no relationship with the DG or Bing Imagen

@luiswalter Sounds good. We can definitely delete the buildings with ^^ characteristics. We can consider DG as newer and Follow DG as standard imagery.

cc @mikelmaron @maning

[luiswalter]

HOT-Malaria validation workflow

- Objective:

• Correct overlap errors and building crossings

  - Tasks

• The tasks below update every day from Monday to Friday with the latest errors in OpenStreetMap

  - To-Fix issues:

  https://osmlab.github.io/to-fix/#/task/crossingbuildinginzimbabwe

  - Changeset comment

  Fixing the overlapping and crossing buildings in Zimbabwe, HOT task (https://osmlab.github.io/to-fix/#/task/crossingbuildinginzimbabwe)

  - Coverage

• Zimbabwe

  - Tools

• If using iD editor, work with To-Fix web
• If using JOSM, work with Josm-tofix-plugin

  - Instructions

• in each To-fix download you might find more than one error. you should try to resolve every error in the download so you don’t have to return to the same place.
• The preferred download should be ~ .20

• Use the validator to locate all possible errors in each To-Fix download.

• Guide the DG Image to eliminate or align the buildings.

• Digital globe Imagery: tms:https://api.mapbox.com/v4/digitalglobe.2lnp1jee/{z}/{x}/{y}.png?access_token=pk.eyJ1IjoiZGlnaXRhbGdsb2JlIiwiYSI6ImNpd3A2OTAwODAwNGUyenFuNTkyZjRkeWsifQ.Y44JcpYP9gXsZD3p5KBZbA

• They should take into account these observations for the elimination of buildings:

  • Buildings that do not make sense and are on top of other buildings.
  • Buildings that are a replica of another.
  • Buildings that have no relationship with the DG or Bing image

• Two members from Peru will work one hour per day to advance the work.

User	Date
@RichRico	29/05 - 02/06
@dannykath	29/05 - 02/06
@karitotp	05/06 - 09/06
@Yurasi	05/06 - 09/06
@ridixcr	12/06 - 16/06
@calfarome	12/06 - 16/06
@luiswalter	19/06 - 23/06
@piligab	19/06 - 23/06
@RichRico	26/06 - 30/06
@dannykath	26/06 - 30/07
@karitotp	03/07 - 07/07
@Yurasi	03/07 - 07/07

• A daily progress report will be made, with a weekly report for Monday's Scrum.
• The work will be registered in the to-fix tasks spreadsheet
• You must run osmlint daily before starting work -> the steps to follow for detections

@Rub21 @mikelmaron @kupendrayadav

[dannykath]

Progress Week 05/29 - 06/02

User	Fixed	Not an error
dannykath	152	116
RichRico	386	298
Total	538	414

Issues solved: 538 Taken time per member: 04:00:00 Hours

@Rub21 @maning

[Yurasi]

This week @karitotp and I only worked Monday, because the file mbtiles for Zimbabwe isn't updating. I've reported this issue to @geohacker. cc. @kupendrayadav @Rub21.

[luiswalter]

Progress Week 06/12 - 06/16

User	Fixed	Not an error
calfarome	1030	395
ridixcr	820	56
Total	1850	451

Issues solved: 1850 Taken time per member: 4:30:00 Hours

@mikelmaron @Rub21 @kupendrayadav

[luiswalter]

This week we will not work on the validation of Zimbabwe, due to the launch of Casper. We focus on Mapbox Street validations @Rub21 @mikelmaron @kupendrayadav

[luiswalter]

I will write a OSM diary, the subject will be the validation in Zimbabwe and I will publish it on July 5

@lukasmartinelli, I want to use your tool to show the progress of the buildings in Zimbawe. Is this possible? Or is it private for the exclusive use of Mapbox.

[mikelmaron]

@luiswalter that animation is public and updated frequently by @kupendrayadav https://www.mapbox.com/malaria-mapping/#5.04/-19.330/24.313

[kupendrayadav]

Yayy!! 1926 Issues completed by @mapbox/map-squad 👏 👏 They worked for 6hrs and made this progress. Amazing work guys.

cc @luiswalter @maning @mikelmaron

[kupendrayadav]

Updated the task with new geojson today. We got 3k+ issues which were done by @mapbox/map-squad in 4hrs. Great progress guys. Keep going.

@luiswalter @mikelmaron @maning

[luiswalter]

@kupendrayadav @mapbox/map-squad thanks for helping in this task, what are the following actions here? I have some questions.

• Going to we continue with the validation work in other countries?
• Until when will we continue with this validations? (The campaign ran until August 31.)

@mikelmaron

[kupendrayadav]

@luiswalter @mikelmaron As per chat with @maning I'm creating a to-fix task for crossing buildings in Zambia. The geojson is not returning any errors to work in Zimbabwe. We knocked off all crossing and overlapping building errors in Zimbabwe. Next actions will be in #311