OpenStreetMap
Gregory Peony's Comments
| Changeset | When | Comment |
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| 157762362 | It seems that you used the nearby river to align your imagery to before mapping. Although the instructions do state to align with existing data, once you start to offset imagery by tens of meters you should consider the strength of the evidence you're basing that decision on. For instance, this river was added in 2017 and does not appear to be mapped in great detail. The course of rivers can be dynamic and change significantly over time, which is why I would generally not recommend using them to align imagery. Idealy you should use 'static' features at ground level to align imagery to. I also could not find any nearby GPS traces to justify this significant offset. For these reasons I will mark this changeset as bad. The data you've added and modified could have confused future users. Don't worry; it doesn't appear to have, and I'll shift the mapping to align with the imagery. Just consider this feedback in your future mapping. Thank you for your contribution.
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| 157762362 | The footprints you added here are valid and appropriately squared, however the offset you've applied to the imagery is very large and ammounts to a shift of ~32.5 m. Visit this url https://livingatlas.arcgis.com/wayback/#active=56102&mapCenter=162.01070%2C-10.56521%2C17 and click near to this settlement. The metadata of this imagery claims to be accurate within 5 m of the true location of objects. This is far smaller than the 32 m you offset the imagery by.
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| 158186244 | I modified these footprints and uploaded them using Changeset: 158390102, so that you can see how I interpret the imagery. I hope this helps.
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| 158186244 | The Western footprint is too large. You can draw the building footprint area ~95% of the roof size initially, so that you have a margin for any change of shape that occurs when you square the footprint. The orientation of the Eastern building is inaccurate. There is a sweet spot of zoom where 1 pixel of the imagery maps onto 1 pixel of your screen. This will allow you to better determine the shape and orientation of buildings, because it is effectively the highest resolution image you can see. Thank you for your contribution.
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| 158186125 | The building footprints that you added are valid and appropriately squared. You made an error when mapping the crucifix shaped building WAY: 1327091573. This resulted in the landuse area and building sharing common nodes and this seems to have also 'knocked' the building footprint out of square. Hold Alt to prevent your cursor from snapping to other features. You can also filter out data via the map data panel. Landuse areas should not share common nodes with buildings. Thank you for your contribution.
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| 158254203 | The buildings in this changeset have not been appropriately squared. When working with low resolution imagery zoom in and out to get the best chance of determining the shape and orientation of features. If this does not help then you should assume that buildings are either square or round if the reolution is so low that you cannot distinguish more complex shapes, because those are common building shapes. Thank you for your contribution.
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| 154301169 | A mixed bag, some of the buildnig footprints here are accurate and have been appropriately squared. WAY: 1303252139, WAY: 1303252140 & WAY: 1303252130 are examples of such footprints, please map more like this in future. One of the main errors you have made here seems to stem from trees partially obscuring buildings in the imagery. Do your best to draw the most likely full footprint of buildings partially obscured by trees. Thank you for your contribution.
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| 156886199 | Not all of the buildings you added have been appropriately squared and some are invalid, because they are definitely no longer present in more recent (ESRI) imagery. The cluster of 3 buildings next to WAY: 1317009758 is an example of this. I have deleted these footprints because they represent a feature that no longer exists, more may also need to be deleted. Please remeber to take care when using imagery sources other than the primary source when contributing. Check the primary source to see if a feature is still present, or if you may have missed features that are visible in the primary source, before uploading (saving your work) . Thank you for your conribution!
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| 156886199 | I'm going to base this comment mostly on bing imagery becuase it appears that you used that imagery exclusively to map this. Some of the buildings you added added here are very well traced, and you managed to accurately trace some more complex shapes which is not the easiest thing to do in ID editor, for example WAY: 1317009744.
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| 158254456 | These building footprints are valid, but they are not accurate, nor appropriately squared. It is common for buildings to have square corners. Check how this area looks like in OSM or select the OSM carto layer in ID editor to see what it might look like to someone using this map. The areas you draw must be close to square in order fot the function to work. WAY: 1327526789 for example is probably too far from square to be made square by pressing q. WAY: 1327526800 is the best footprint in this set, please map more similar to that in future and remember to square the corners when appropriate. Thank you for your contribution.
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| 156886114 | Errors and how to rectify them. All of the building footprints here should be squared becuase that is likely closer to reality, but none of have been. Buildings with square corners are quite common, so, unless you have good evidence to suggest that the angles between walls is different, you should square the footprints. Trace the footprints accurately (enough), tag the area as a building, and press q to square them. You can modify them after you draw them e.g. move & rotate. The imagery you used allows for these footprints to be mapped with greater accuracy e.g. WAY: 1317009395 is not a trapezoid but something you might consider a 'T' shaped building. I recommend using Mapbox in this region. Please try to keep you edits within your task area. Thank you for your contribution.
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| 156886114 | POSITIVES: You correctly identified buidlings visible in bing imagery. WAY: 1317009396 is the closest to a good footprint from this set, map more similar to that one in future please. Thank you for your contribution.
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| 154295321 | Building footprints are oversized. This seems to have caused further problems like buildings sharing nodes if they are close to one another. Generally: Building footprint <= Building roof, so you can map the footprint slightly smaller than the roof, to give yourself a margin while remaining reasonably accurate.
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| 154294902 | The building on the left is appropriately squared and has roughly the correct shape, though it is oversized and the orientation is not accurate. The footprint on the right should also be squared. Thank you for your contribution.
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| 154288912 | The building footprints are inaccurate becasue they are oversized and not squared, though they should be. In order to square buildings the nodes must be placed accurately enough before hand, else they might not square. This is to allow for mapping fo buildings which have some square corners but also others which are not. The imagery allows for you to map these buildings more accurately than this.
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| 154289009 | I modified this building and uploaded my changes in Changeset: 158357152 for you to use as a reference/example. I aligned the building to ESRI imagery.
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| 154289807 | Negatives: Buildings share nodes with other buildings and features like landuse areas. To avoid this error hold 'Alt' while drawing to prevent your cursor from snapping to existing nodes and features. You can also filter out data that may be getting in your way like the landuse area, so that you do not interact with it. Building footprints are inaccurate and offset with regard to the primary imagery source. Quality > Quantity. Zoom in to accurately place nodes on the corners of buildings, tag them, and press q to square them when appropriate. Since ESRI is the primary source you should offset any suplimentary sources so that the mapping you do is aligned. ID should have displayed warnings alerting you to some of these errors. Explore the suggested options to resolve warnings, and ask for help if you're not sure what to do.
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| 154289807 | Positives: You made a good decision to use Mapbox as an imagery source due to its superior resolution. All footprints you added outline buildings visible in imagery. Thank you for your contribution.
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| 157280926 | I modified the footprints in this changeset and uploaded them in Changeset: 158356082 hopefuly for you to use as a reference/example.
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| 157280926 | Although the footprints do contain buidings within their boundary, they are oversized and the imagery allows for the orientation of the left most building (WAY: 1319464370) to be more accurate. You can reference Mapbox imagery in this area becasue of it's superior resolution. Thank you for your contribution.
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