Please read about how to use the layer tag here layer=*#Guidelines

I mapped the footprint smaller than the roof, becasue the roof has a unique shape. I though this was due to it overhanging the walls. Perhaps you saw or considered something I had not.

I placed the POI between the two groups of buildings I think form a settlement. Why does it seem incorrect? How would you map it?

I like to explain the why, but I will try to be as brief as possible in future.

I comment on changesets sometimes, becasue they are more specific than tasks. You yourself have commented on others' changesets. Not everyone contributes via a tasking manager, so others already have and possibly will communicate with you via OSM.

Thanks for your reply.

Re imagery: Of course I think that there are inaccuracies when looking at the imagery used for mapping the footprints. I you view my changeset one of the buildings differs by a factor of two, though most are probably a few tens of %.

Re precision: I can only go off of what I know and see, so I wasn't sure you were aware of the concepts I commented about. I am not advocating for mm precision or anything like that, just that the footprints be equal to, or slightly smaller (90-95%) than the roof giving a range sizes I'd consider being as accurate as the imagery allows.

As far as time goes, I figure it shouldn't make a big diference, at worst. At best it may save you time especially in dense areas, or if there's a lot of existing data. Personally this approach saved me some time, becasue in the past I would use the vertecies of roofs to aquire a buildings' shape and size (like shown in the vast majority of tutorials/guides), but that leaves little wiggle room. You may actually find that it saves you time too.

- Best

I agree that the quality of the imagery here is not as good as the changeset I was originally commenting on changeset/171738491, however I see what I think are inaccuracies and am sharing my interpretation to discuss mapping, not "argue" or start an edit war.

I wrote my comments after reviewing your contributions and go off of what I can see. I am not spamming, nor am I a mind reader; I cannot exhaustively know what what you would find bothersome in advance, therefore this is an unreasonable expectation. Ultimately if you make a contribution to OSM, then it is open for discussion by defualt.

Why did you extend the footprint here?
---

Published using OSMCha: https://osmcha.org/changesets/173094936

Hello, I would say you partially improved/updated the residential areas here by including buildings and residential areas in settlements, however a significant proportion of both residential areas includes water from the river which shouldn't generally be done unless the houses are on stilts, or floating, or something like that, which does not appear to be the case here.

Please consider the context, landuse, errosion, vegetation and other features when mapping residential areas. Here much of the Western part of the Northern selltlment is flooded in the most recent imagery, either due to a high water level or river bank errosion.

The shape of the Northern settlement has changed due to this, reference ESRI Clarity. i.e. there are a simmilar number of buildings in total in this settlement, but they are now in the East, so I doubt that the Western part will be rebuilt/resettled. When you see cases like this in future consider the feature you're mapping over a broarder time frame. Pressing ctrl+h will show you the history of selected features in JOSM. You can see how I mapped it in https://osmcha.org/changesets/173154295

Please keep this feedback in mind when contributing in future. Thank you for your contribution. If you want to experience the OSM community or to get timely feedback from other mappers; I recommend that you attend a mapathon. You can find events here https://osmcal.org/

Please consider the context, landuse, errosion, vegetation and other features when mapping residential areas. Here much of the Western part of the selltlment is flooded in the most recent imagery, either due to a high water level or river bank errosion.

The shape of the settlement has changed due to this, reference ESRI Clarity. i.e. there are a simmilar number of buildings in total in this settlement, but they are now in the East, so I doubt that the Western part will be rebuilt/resettled. When you see cases like this in future consider the feature you're mapping over a broarder time frame. Pressing ctrl+h will show you the history of selected features in JOSM. You can see how I mapped it in https://osmcha.org/changesets/173154295

Please keep this feedback in mind when contributing in future. Thank you for your contribution.
---
#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/173094581

Please do not copy and paste features unless they truly have the same shape.

Please don't copy and paste features, unless they truly have the same shape.

Please take care when mapping beyond task boundaries in an active project; it seems like you added some duplicate building footprints due to this. don't worry I resolved them.

[ENG] Hi, I see it's been a while since you mapped this, but did you actually know that the buildings you mapped in this area are houses or were you just using aerial imagery? You enveloped multiple buildings in individual footprints, so I'm trying to figure out how to tag the individual buildings.

Hi you can see how I improved one of the footprints here in https://osmcha.org/changesets/173019816 Thank you for your contribution. If you want to experience the OSM community or to get timely feedback from other mappers; I recommend that you attend a mapathon. You can find events here https://osmcal.org/
---

Published using OSMCha: https://osmcha.org/changesets/172437405

Welcome to OSM and thank you for your contribution!

I've reviewed this contribution, and the following is my evaluation. This changeset is a bit of a mixed bag. Generally you improved the accuracy of existing building footprints while preserving their history, and added some that represent buildings, which is really good. However some of these footprints could be more accurate and at times envelope multiple buildings. I'll give you some general comments about the mistakes I see here. It may seem like a lot, so I recommend starting by watching the videos. Idealy attend a mapping event where someone can show you in real time how to improve the mapping here. You can find events at https://osmcal.org/

Each footprint should represent a building. Make a note of how a scene is lit, in which direction shadows are cast, and whether you can see the sides of features with height. A change in colour and difinitive shadows can indicate a building. Lookout for features like highways, barriers, and vegetation which may look similar to buildings. Although we are not always mapping other features, considering them will mean you better understand the context improving your interpretation of imagery. Cross referencing an imagery with different properties can help. Sometimes buildings may appear to share a common wall, but this is sometimes an illusion; only map them with shared nodes if you have reason to believe that they really do touch.

When mapping buildings, please trace the shape accurately. Accurate building footpritns aid population estimates and prevent issues like data overlaps. Zoom in so that you can see the outline of the building and mark the corners carefully. Exclude shadows and yards when tracing the footprint. Keep in mind that you are looking at the [roofs of buildings](roof:shape=*#Roof_shape), but mapping their footprints. Depending on how the scene is lit, pitched roofs may have light and dark sections that belong to one building. Generally pitched roofs overhang the walls of a building, so a footprint slightly smaller than the roof is accurate. You can scale selected features in ID with shift+(-/+), or JOSM with ctrl.+alt+Lclick & drag. Take care to make contributions that others can build upon.

After tracing and tagging features which are likely square or round, please remember to square their corners (q), or circularise them (o), because it is almost impossible and time consuming to draw shapes so percisely by hand. Buildings with metal or pitched roofs tend to have square corners; round buildings are identifiable by the distinctive cresent shaped shadow they cast. Unless the building is clearly a different shape then it's best to assume that it should be rounded or its corners should be squared. In the iD Editor, you can right click for access to editing functions. Since roofs tend to overhang walls trace the initial shape slightly smaller to allow a buffer for any change in size that may occur. In JOSM use the [buildingstools plugin](osm.wiki/JOSM/Plugins/BuildingsTools). In ID you must draw the shape accurately enough else shapes will not completely square. This [video about squaring features in ID](https://youtu.be/Xs5wX592E1o) has more information and a demo.

When mapping with imagery captured at an angle, please position features where they are at ground level. You can map the outline of the roof and then reposition the building to the base of the walls. I recommend you watch this [video about mapping dense urban areas](https://youtu.be/JAPiGntG6fs) and read this [written guide](osm.wiki/Roof_modelling#Typical_errors_in_the_interpretation_of_roof_geometry_from_aerial_images).

Keep on mapping!

Hello, I do not think that these are isolated dwellings, becasue they are only a few tens of meters apart. Even if you don't map a residential area I would generally map a situation like this with a single place node as in https://osmcha.org/changesets/172938627 Consider which places are likely to have their own names and settlement type/distribution. Please keep this feedback in mind when contributing in future. Thank you for your contribution. If you want to experience the OSM community or to get timely feedback from other mappers; I recommend that you attend a mapathon. You can find events here https://osmcal.org/
---
#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/172819360

Welcome to OSM! it looks like you identified buildings in imagery, but could have mapped them more accurately. * Please accurately outline all buildings. Use the shadows that buildings cast to infer the size of the building, but exclude the shadows cast on the ground from the size of the footprint.
* Buildings should have their corners squared. Please view the video linked in the project instructions and [this one about squaring footprints](https://youtu.be/Xs5wX592E1o). Please keep this feedback in mind when contributing in future. Thank you for your contribution. If you want to experience the OSM community or to get timely feedback from other mappers; I recommend that you attend a mapathon. You can find events here https://osmcal.org/
---
#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/172749271

where possible please modify existing features instead of deleting and remapping. On this occasion there's not really any harm done since the existing one didn't have much history. Thank you for your contribution. If you want to experience the OSM community or to get timely feedback from other mappers; I recommend that you attend a mapathon. You can find events here https://osmcal.org/
---
#REVIEWED_GOOD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/172754843

Hi, it looks like you identified and mapped buildings here. Use the shadow a building casts to infer its footprint, but please take care to exclude them from the size of the building footprint.

Hi, I'm provideing a review since you requested it. All footprints you mapped represent buildings and have been appropriately squared, please take care to exclude the shadows on the ground from the size of a building's footprint. The highways seem generally reasonably mapped and tagged with a few minor inaccuracies. Thank you for your contribution. If you want to experience the OSM community or to get timely feedback from other mappers; I recommend that you attend a mapathon. You can find events here https://osmcal.org/
---
#REVIEWED_GOOD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/172709779

https://tasks.hotosm.org/projects/31983/tasks/?search=760 Thank you for your contribution. If you want to experience the OSM community or to get timely feedback from other mappers; I recommend that you attend a mapathon. You can find events here https://osmcal.org/
---
#REVIEWED_GOOD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/172730664