Re: [HOT] Remote area mapping, clouds, six questions
Suzan - I would like to hear from others. Here are my newbie thoughts: ONE Small structures that may not be houses: This may depend on the project. For #1018, Nepal Detailed Mapping 2nd Pass, the instructions are to tag buildings as building=yes rather than as 'house'. So I have included some small buildings that may not be houses. In a village with many obvious houses I include less of the smaller buildings, which is inconsistent but seems reasonable given the time crunch. TWO Geologic structures that may appear to be buildings: I make a judgement call on these, but if I can't distinguish straight edges then I generally don't include it. THREE Changing other's work I have changed others' work. For example, a way tagged as highway=track when it really appears to be just a path, I may change it to 'path'. However, I check the tags first to see if there's a source, in which case I don't change it. I correct triangle buildings as they could be confusing (the JOSM buildings_tools plugin does make it much easier to enter rectangular buildings). FOUR Exact building shape For larger buildings with unusual shape I correctly entered the shape. But generally I just put in a rectangle for what I assume is the main building. I put myself in the position of the map user - if they can figure out which building is which, I figure that's enough. FIVE Residential vs. all houses marked Project #1018 *revised* instructions are explicit: Trace ALL individual buildings and tag it as building=yes. For clusters of building, DO NOT enclose the whole area as one building. It is important to trace individual structures for future damage analysis. So I have been correcting enclosed 'residential' areas with no building outlines. Your project may differ, but I would expect consistency across most Nepal mapping projects. SIX Up to date BING images? Good question - the imagery date is apparently not available for some imagery (odd). I have read that the JOSM context (right-click) menu option to Show Tile Info will show the Bing imagery date, but it does not work for me. When I Show Tile Info nothing happens. This link indicates it should show the capture date: http://josm.openstreetmap.de/ticket/8573 Steve On Thu, Apr 30, 2015 at 7:52 PM, john whelan jwhelan0...@gmail.com wrote: small buildings building=yes, let some on the ground say its a house etc. If a building is not a triangle then change it to a rectangle. JOSM building tool is fast and very easy to use. Some projects want all buildings, some want residential areas and highways, all buildings are nice but there is a lot of ground to cover so read the instructions first, if you can get away with residential areas rather than buildings according to the instructions go for the residential areas and get more ground mapped in the same time. Cheerio John On 30 April 2015 at 19:39, Suzan Reed su...@suzanreed.com wrote: ONE Small structures/houses In remote areas, lightly populated, it's difficult to see if a small structure is a house or something else. I am labeling them all house. Is this correct? People live in tiny places in Nepal, less that 25' square. They are hard to discern. If it looks like a building, I mark it as a house. Is this good? TWO Geologic structures It is difficult to tell geologic structures from houses in some cases. I look to see if there are similar structures in the landscape, if there are fields or agriculture, then mark it as a house as I have been erring on the side of marking houses and having people recognized as being there than not. I want everyone on the map. This may mean I've made mistakes and it's a huge boulder with a shadow. Comments? THREE Changing other's work Also, some of my colleagues have marked houses with triangles, not rectangles. Can I correct these? FOUR Exact building shape Is the shape of the building important? It's often difficult to tell if it's part of the house or an outbuilding or a shed near the house. Knowing there are people living there seems more important, but if the actual shape is important, I will go back and redo my work. FIVE Residential vs. all houses marked Many remote villages are simply marked with a polygon Residential Area. Should I add the structures to these areas? SIX Up to date BING images? Also, how recent are the Bing images? In remote areas, much could have been lost to landslides. I also come across areas with clouds. I can go back and map these if the images are refreshed. ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
Re: [HOT] Remote area mapping, clouds, six questions
Suzan, ONE: Because we don't know for sure if these structures are houses, we just tag them as Building. Something the size of a house could be Siddharta's Car Repair, so we're safest with Building. TWO: Could be a huge boulder, but, if it's rectangular, that's unlikely. Most likely, if it's square or rectangular, it's a building. Also, if you look for shadows along the edge, sometimes you can see that it's about one story tall and has a straight roofline. THREE I doubt there are many triangular buildings. Yes, change those. FOUR Try to do the exact building shape. That makes it easier for field teams to match actual buildings to the map. It can be a challenge if the building has a couple of wings and a porch, but it is helpful. FIVE Yes, please add the individual buildings within the residential polygon. SIX Most of the Bing images are not after the earthquake. Some imagery is recent, notably that marked DigitalGlobe, but I'm not sure if it is after the earthquake. Can anyone else answer this question? Thanks for all your hard work. Charlotte At 04:39 PM 4/30/2015, you wrote: ONE Small structures/houses In remote areas, lightly populated, it's difficult to see if a small structure is a house or something else. I am labeling them all house. Is this correct? People live in tiny places in Nepal, less that 25' square. They are hard to discern. If it looks like a building, I mark it as a house. Is this good? TWO Geologic structures It is difficult to tell geologic structures from houses in some cases. I look to see if there are similar structures in the landscape, if there are fields or agriculture, then mark it as a house as I have been erring on the side of marking houses and having people recognized as being there than not. I want everyone on the map. This may mean I've made mistakes and it's a huge boulder with a shadow. Comments? THREE Changing others' work Also, some of my colleagues have marked houses with triangles, not rectangles. Can I correct these? FOUR Exact building shape Is the shape of the building important? It's often difficult to tell if it's part of the house or an outbuilding or a shed near the house. Knowing there are people living there seems more important, but if the actual shape is important, I will go back and redo my work. FIVE Residential vs. all houses marked Many remote villages are simply marked with a polygon Residential Area. Should I add the structures to these areas? SIX Up-to-date BING images? Also, how recent are the Bing images? In remote areas, much could have been lost to landslides. I also come across areas with clouds. I can go back and map these if the images are refreshed. ___ HOT mailing list mailto:HOT@openstreetmap.orgHOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot Charlotte Wolter 927 18th Street Suite A Santa Monica, California 90403 +1-310-597-4040 techl...@techlady.com Skype: thetechlady ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
[HOT] Remote area mapping, clouds, six questions
ONE Small structures/houses In remote areas, lightly populated, it's difficult to see if a small structure is a house or something else. I am labeling them all house. Is this correct? People live in tiny places in Nepal, less that 25' square. They are hard to discern. If it looks like a building, I mark it as a house. Is this good? TWO Geologic structures It is difficult to tell geologic structures from houses in some cases. I look to see if there are similar structures in the landscape, if there are fields or agriculture, then mark it as a house as I have been erring on the side of marking houses and having people recognized as being there than not. I want everyone on the map. This may mean I've made mistakes and it's a huge boulder with a shadow. Comments? THREE Changing other's work Also, some of my colleagues have marked houses with triangles, not rectangles. Can I correct these? FOUR Exact building shape Is the shape of the building important? It's often difficult to tell if it's part of the house or an outbuilding or a shed near the house. Knowing there are people living there seems more important, but if the actual shape is important, I will go back and redo my work. FIVE Residential vs. all houses marked Many remote villages are simply marked with a polygon Residential Area. Should I add the structures to these areas? SIX Up to date BING images? Also, how recent are the Bing images? In remote areas, much could have been lost to landslides. I also come across areas with clouds. I can go back and map these if the images are refreshed. ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
Re: [HOT] Remote area mapping, clouds, six questions
small buildings building=yes, let some on the ground say its a house etc. If a building is not a triangle then change it to a rectangle. JOSM building tool is fast and very easy to use. Some projects want all buildings, some want residential areas and highways, all buildings are nice but there is a lot of ground to cover so read the instructions first, if you can get away with residential areas rather than buildings according to the instructions go for the residential areas and get more ground mapped in the same time. Cheerio John On 30 April 2015 at 19:39, Suzan Reed su...@suzanreed.com wrote: ONE Small structures/houses In remote areas, lightly populated, it's difficult to see if a small structure is a house or something else. I am labeling them all house. Is this correct? People live in tiny places in Nepal, less that 25' square. They are hard to discern. If it looks like a building, I mark it as a house. Is this good? TWO Geologic structures It is difficult to tell geologic structures from houses in some cases. I look to see if there are similar structures in the landscape, if there are fields or agriculture, then mark it as a house as I have been erring on the side of marking houses and having people recognized as being there than not. I want everyone on the map. This may mean I've made mistakes and it's a huge boulder with a shadow. Comments? THREE Changing other's work Also, some of my colleagues have marked houses with triangles, not rectangles. Can I correct these? FOUR Exact building shape Is the shape of the building important? It's often difficult to tell if it's part of the house or an outbuilding or a shed near the house. Knowing there are people living there seems more important, but if the actual shape is important, I will go back and redo my work. FIVE Residential vs. all houses marked Many remote villages are simply marked with a polygon Residential Area. Should I add the structures to these areas? SIX Up to date BING images? Also, how recent are the Bing images? In remote areas, much could have been lost to landslides. I also come across areas with clouds. I can go back and map these if the images are refreshed. ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot ___ HOT mailing list HOT@openstreetmap.org https://lists.openstreetmap.org/listinfo/hot
