Hi it looks like you duplicated footprints by mapping new ones on top of existing ones. If you want to improve the existing data then please modify it instead of deleting or re-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/
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#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/171060796

Hi, you mapped a waterway/highway crossing as both a bridge and a culvert (Jalan Pemuda/Kali Mapuruka). Usually in OSM (though it can be difficult to identify) it is one or the other. If you had to choose would you say that this is a bridge or culvert?

The footprint I flagged envelopes multiple buildings. Each footprint should represent one building. Use shadows and colors to determine when one building ends and another begins. 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/
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#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/171068840

Welcome to OSM and thank you for your contribution!

You identified buildings in the imagery.

Sometimes you enveloped multiple buildings in a single footprint; each footprint should represent one building. Use colours and shadows to deternine where one building ends and another begins.

While it's good that you're trying to be efficient, you inappropriately copy and pasted building footprints here i.e. the copied footprints did not accurately represent buildings visible in the imagery. One of the best ways to be efficient is to make high quality contributions; that way the data won't need to change unless the ground truth does.

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, 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 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.

Keep on mapping!

Welcome to OSM and thank you for your contribution!

You identified buildings in the imagery.

While it's good that you're trying to be efficient, you inappropriately copy and pasted building footprints here i.e. the copied footprints did not accurately represent buildings visible in the imagery. One of the best ways to be efficient is to make high quality contributions; that way the data won't need to change unless the ground truth does.
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, 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 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.

Keep on mapping!

Hi, the vast majority of buildings you added here are valid and represent those visible in imagery, however they could be more accurate as they are generally oversized and could be more accurately positioned relative to one another.

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, 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.

Sometimes it looks like you included a building's walls in its size and shape. Look to the SE at the taller buildings to more easily see which walls of buildings are visible in imagery.

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/

Awesome! You're most welcome! I corrected the postion of one of the footprints you added here. You can check the following link to see various changesets I uploaded where I mentioned nadir in the comment for examples of how I mapped using off-nadir imagery. Beware of the imagery that was used for the mapping. Sometimes offsets may have been applied which; in cases like this you're unlikely to immediately see the footprints in the correct position just by loading the imagery. https://osmcha.org/changesets/170897311?filters=%7B%22uids%22%3A%5B%7B%22label%22%3A%2216598557%22%2C%22value%22%3A%2216598557%22%7D%5D%2C%22date__gte%22%3A%5B%7B%22label%22%3A%22%22%2C%22value%22%3A%22%22%7D%5D%2C%22comment%22%3A%5B%7B%22label%22%3A%22nadir%22%2C%22value%22%3A%22nadir%22%7D%5D%7D

Hi, this is certainly a more difficult situation and took me a short while to figure out, but I think that you mapped roof furniture (like building parts, HVAC systems, or walls etc.) here instead of the buildings' footprints themselves. I can see why it might be confusing, becasue some of the roofs have walls on some edges making buildings difficult to differentiate from yards in ESRI. When mapping compounds it can be accurate to map the individual buildings and walls connecting/enveloping them.

If you haven't done so already look at bing imagery in this area to aid your interpretation. I put the primary source in the first layer and use the alt+number shortcuts to toggle supporting layers to aid my interpretation.

I also viewed mapillary street level imagery to better understand the context and I recommend you do so too. Check out the more complex roof geometries/furniture and how they compare to the footprint. This should also further convince you to map footprints slightly smaller than what you see in imagery when you see how the roofs overhang the footprins of buildings at ground level.

See how I mapped this here https://osmcha.org/changesets/171160875

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/

Hi Rabina, I'm not sure why you requested a review of this changeset, but the footprints to me look valid though they could be more accurate. See how I mapped this here https://osmcha.org/changesets/171160504

I expanded the NW footprint to its south after cross referencing bing imagery. Map it how you think is most likely in reality and if you really cannot tell then map features assuming them to be seperate to make surveys easier.

I then uploaded that change extending the footprint here https://osmcha.org/changesets/171160596
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#REVIEWED_GOOD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/171091745

I resolved the overlapping and duplicated data with https://osmcha.org/changesets/171107943
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#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/170271278

I resolved the tagging in Changeset: 171108062 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/
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#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/170270402

You duplicated data when adding these footprints, because you mapped on top of already existing footprints. It looks like you mapped outside your task boundary which led to a conflict with another contributor.

Modify existing data when you can tell which feature it represents, and delete features which you are certain no longer exist.

Please do not snap the corners of the buildings to other buildings or features such as roads and paths. In the iD Editor, hold down the `Alt` key to keep nodes from snapping to other objects and accidentally connecting. This [video about connected nodes](https://youtu.be/ltn1VOiq5_0) has more information and a guide.

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/
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#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/170271278

Southern footprint is good, northern is oversized and although the roof is slightly curved the building is likely square.

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/
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#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/170271234

Welcome to OSM! Looks like you're took care to map footpritns accurately here; I recommend mapping them slightly smaller since roofs tend to overhang walls.

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, 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.

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/

Generally you appear to be identifying buildings in imagery thoguht you are not mapping them as accurately as possible.

Beware that there is a difference between building footprints and residential areas which tend to envelope them. Check here for details of tags you do not understand osm.wiki/Map_features. Residential areas and buildings should not share common/grey nodes.

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/
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#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/170272216

Please do not snap the corners of the buildings to other buildings or features such as roads and paths. In the iD Editor, hold down the `Alt` key to keep nodes from snapping to other objects and accidentally connecting. This [video about connected nodes](https://youtu.be/ltn1VOiq5_0) has more information and a guide.

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/170271473

I flagged some footprints that envelope multiple buildings. 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/
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#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/170271268

Buildings can be round too. Complete the ID editor walkthrough before contributing further, if you haven't already. 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/
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#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/170270798

Hi, you spotted buildings in the imagery (and even one obscured by clouds), but could have mapped them more accurately.

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, 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 mapping buildings, please remember to square their corners. Most buildings have square corners because that's easy to build. Unless the building is clearly a different shape then it's best to assume that the corners should be squared. In the iD Editor, use the `Q` key to square the corners. This [video about squaring features](https://youtu.be/Xs5wX592E1o) has more information and a guide.

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/

Welcome to OSM! You have enveloped multiple buildings in onw footprint; each footprint should represent one building. 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/170271385