It looks like you both appropriately and inappropriately copy and pasted footprints here. I recommend doing this if the buildings truly have the same geometry e.g. the row of metal roofed buildings in the Southern cluster. However some other footprints are oversized becasue of this.

Thank you for your contribution!

When mapping buildings, please trace the shape accurately. Accurate building footpritns aid population estimates and prevent issues like data overlaps. Zoom out to obtain the orientation and shape, then zoom in so that you can accurately draw the footprint. 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.

Keep on mapping!

The footprints you mapped here represent buildings, but you created invalid shared nodes while doing so.

Thank you for your contribution!

Please do not connect the corners of buildings to other buildings or features such as highways or residential areas. In the iD Editor, hold down the `Alt` key to prevent your cursor from snapping to existing data and accidentally creating shared(grey) nodes. This [video about connected nodes](https://youtu.be/ltn1VOiq5_0) has more information and a guide.

Keep on mapping!

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/175504292

All footprints you mapped here represent buildings. You did an excellent job working with the existing data by deleting the footprints which you could tell represented no longer existing buildings, while preserving the one that you were able to identify in the imagery. Well done!

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/175504300

Good attempt at mapping this partially obscured building. I do not think it is as big as you've mapped it though. Look at the paths in the imagery and note how they would overlap this building, if it were in fact so large. See how I mapped it in https://osmcha.org/changesets/175510032

Thank you for your contribution!

Sometimes features are obscured by others in imagery e.g. tall buildings, vegetation, shadows, or clouds. Sometimes using another imagery source in these instances can allow you to view the feature of interest directly. Our goal is to map the ground truth accurately, so if the feature is obscured in all available sources, then use what you can see (and other map data) to estimate its shape, size, position and orientation. Think about what space is already occupied by other features e.g. Consider where a tree's trunk meets the ground.

Keep on mapping!

Why did you delete these footprints? If you delete a fair number of features its good to provide your rationale in a changeset comment so others know why you did something.

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/
---

Published using OSMCha: https://osmcha.org/changesets/175504358

Hi, the footprints you mapped here represent buildings, but I see 3 main mistakes.

1. they could be more accurate.

2. they haven't been squared.

3. You created invalid shared nodes.

The following feedback may seem quite long, but it will help you address all the problems listed.

Thank you for your contribution!

Each footprint should represent a building. Please watch [this video about imagery interpretation](https://www.youtube.com/watch?v=CJ-vUwtS3A8). 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 out to obtain the orientation and shape, then zoom in so that you can accurately draw the footprint. 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.

Please do not connect the corners of buildings to other buildings or features such as highways or residential areas. In the iD Editor, hold down the `Alt` key to prevent your cursor from snapping to existing data and accidentally creating shared(grey) nodes. This [video about connected nodes](https://youtu.be/ltn1VOiq5_0) has more information and a guide.

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 manually. 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 which may occur. In JOSM use the [buildingstools plugin](osm.wiki/JOSM/Plugins/BuildingsTools). In ID you must draw the shape accurately enough if you want every corner to be squared. This [video about squaring features in ID](https://youtu.be/Xs5wX592E1o) has more information and a demo.

Keep on mapping!

All footprints represent buildings. I would have mapped the round footprints as square in this case. It looks like on occasion you enveloped multiple buildings with one footprint. some footprints here are oversized.

Thank you for your contribution!

Each footprint should represent a building. Please watch [this video about imagery interpretation](https://www.youtube.com/watch?v=CJ-vUwtS3A8). 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 out to obtain the orientation and shape, then zoom in so that you can accurately draw the footprint. 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.

Keep on mapping!

All but one footprint here appear valid. The other I would map as two seperate buildings. Please regularise the shapes after tagging when appropriate.

Thank you for your contribution!

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 manually. 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 which may occur. In JOSM use the [buildingstools plugin](osm.wiki/JOSM/Plugins/BuildingsTools). In ID you must draw the shape accurately enough if you want every corner to be squared. This [video about squaring features in ID](https://youtu.be/Xs5wX592E1o) has more information and a demo.

Keep on mapping!

All footpritns here represent buildings accurately, if they were ever so slightly smaller they'd be as accurate as the imagery allows.

Thank you for your contribution!

When mapping buildings, please trace the shape accurately. Accurate building footpritns aid population estimates and prevent issues like data overlaps. Zoom out to obtain the orientation and shape, then zoom in so that you can accurately draw the footprint. 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.

Keep on mapping!

All footprints represent buildings, but could be more accurate. It looks like you enveloped multiple buildings with individual footprints.

Thank you for your contribution!

Each footprint should represent a building. Please watch [this video about imagery interpretation](https://www.youtube.com/watch?v=CJ-vUwtS3A8). 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 out to obtain the orientation and shape, then zoom in so that you can accurately draw the footprint. 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.

Keep on mapping!

All footprints you added here represent buildings, please take care to exclude the shadows cast on the ground and regularise the shapes after tagging.

Thank you for your contribution!

When mapping buildings, please trace the shape accurately. Accurate building footpritns aid population estimates and prevent issues like data overlaps. Zoom out to obtain the orientation and shape, then zoom in so that you can accurately draw the footprint. 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 manually. 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 which may occur. In JOSM use the [buildingstools plugin](osm.wiki/JOSM/Plugins/BuildingsTools). In ID you must draw the shape accurately enough if you want every corner to be squared. This [video about squaring features in ID](https://youtu.be/Xs5wX592E1o) has more information and a demo.

Keep on mapping!

You identified and mapped buildings just map them slightly smaller than the roof you see in future.
---

Published using OSMCha: https://osmcha.org/changesets/175505668

The footpritns I flagged appear to have been moved to represent different buildings than they originally did.
---

Published using OSMCha: https://osmcha.org/changesets/175504443

The vast makority of footprints here represent buildings, but some could be more accurate. Here Bing happens to show the same scene as ESRI so you could align Bing to ESRI and map using it when that's the case.
---

Published using OSMCha: https://osmcha.org/changesets/175504471

The vast makority of footprints here represent buildings, but some could be more accurate. Here Bing happens to show the same scene as ESRI so you could align Bing to ESRI and map using it when that's the case.
---

Published using OSMCha: https://osmcha.org/changesets/175504471

The vast makority of footprints here represent buildings, but some could be more accurate. Here Bing happens to show the same scene as ESRI so you could align Bing to ESRI and map using it when that's the case.
---

Published using OSMCha: https://osmcha.org/changesets/175504471

All footprints you added here represent buildings in the imagery, but please take care to not include the shadows cast on the ground in the size of footprints.

Thank you for your contribution!

When mapping buildings, please trace the shape accurately. Accurate building footpritns aid population estimates and prevent issues like data overlaps. Zoom out to obtain the orientation and shape, then zoom in so that you can accurately draw the footprint. 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.

Keep on mapping!

All footpritns here look valid but the NE one is oversized.

Thank you for your contribution!

When mapping buildings, please trace the shape accurately. Accurate building footpritns aid population estimates and prevent issues like data overlaps. Zoom out to obtain the orientation and shape, then zoom in so that you can accurately draw the footprint. 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.

Keep on mapping!
---

Published using OSMCha: https://osmcha.org/changesets/175504463

Thank you for taking care to preserve the history, however take care not to mix it either. Deletions are appropriate if the feature either has ceased to or has never existed. Cross-reference bing and see that some buildings no longer exist and should be deleted.

I haven't analysed it myself, but just note that the instructions recommend offsetting the imagery rather than moving data in this project.

osm.wiki/Keep_the_history#Don't_mix_the_history

Thank you for your contribution!

When mapping buildings, please trace the shape accurately. Accurate building footpritns aid population estimates and prevent issues like data overlaps. Zoom out to obtain the orientation and shape, then zoom in so that you can accurately draw the footprint. 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.

Please do not connect the corners of buildings to other buildings or features such as highways or residential areas. In the iD Editor, hold down the `Alt` key to prevent your cursor from snapping to existing data and accidentally creating shared(grey) nodes. This [video about connected nodes](https://youtu.be/ltn1VOiq5_0) has more information and a guide.

Keep on mapping!

Thanks for taking care to preserve histort please see osm.wiki/Keep_the_history#Don't_mix_the_history