Pokhara

Nepal



Pokhara, Nepal

Pokhara is located near the base of the Himalayas, where the residents are subject to earthquakes and flooding events from the Seti Gandaki River. Help us to map critical infrastructure in Pokhara. Using current high-resolution imagery, we will digitize roads, buildings and open areas within the city. OpenStreetMap will be used as the platform to digitize and store data for usage by first responders, planners and geospatial enthusiasts.

Banner image: A view of Pokhara from Sarangkot by Dhilung Kirat (http://dhilung.com)


Roads

The whole process of creating a road looks is captured in the GIF to the left. Click on the image for a larger version of the image.

https://cloud.githubusercontent.com/assets/7816685/6836500/ebe377f0-d318-11e4-914a-a74a1d0e7bf7.gif

Tracing Roads

To trace a road, use the Line tool in iD Editor (Keyboard Shortcut: 2) and trace along the middle of the road. See below for an example of too few nodes (left), too many nodes (center), and the right amount of nodes (right).



https://cloud.githubusercontent.com/assets/9657971/6357023/72270044-bc2f-11e4-874f-e534af609d60.png


Roads Must Intersect

Roads must be connected where they intersect. Make sure the roads connect to each other where they cross. You should see a node appear at each intersection.

https://cloud.githubusercontent.com/assets/7431774/6626271/cefa345a-c8cb-11e4-8704-00197078a9e2.png

Classifying Roads

highway = *

All roads are classified as some type of highway. Roads are primarily classified based on their function. Tertiary roads connect villages and major streets in towns of some importance. Secondary and Primary roads connect medium and large cities. Motarways are restricted access highways. Sometimes it is difficult to immediately recognize what type of roads exist. An option is being able to re-classify some of the roads at a later point.

In this project, most of the roads you collect will be either a tertiary road, residential road, track, or path.

surface = *

In addition to using the highway tag, one can indicate the physical surface of the road with the surface tag:

Generically, a hard surface (asphalt, cobblestone, concrete…) is indicated with surface=paved and a soft one (ground, sand…) with surface=unpaved.

https://cloud.githubusercontent.com/assets/2665840/6723788/3645c0f6-cdc3-11e4-9cc5-fac202b4a235.png

Tertiary Roads

####highway = tertiary:

The most obvious, widest paths that you see should be classified as “tertiary roads”. These roads are easily seen in the drone imagery and will seem wide enough for two cars to pass.

https://cloud.githubusercontent.com/assets/2665840/6719919/afdf672a-cd94-11e4-84dd-06e38b16fbeb.jpg

Residential Roads

highway = residential:

This tag is used for roads in or around residential areas except the major roads. Generally we would want you to classify a road this way if you suspect that it is used mostly by people that live on the road. Roads lined by residential buildings are good signs. If your unsure than use 'unclassified' value.

https://cloud.githubusercontent.com/assets/2665840/6719965/236f0a88-cd95-11e4-8e8a-d02e3b04c146.jpg

Tracks

highway = tracks:

This tag represents roads for mostly agricultural use, forest tracks etc.; usually unpaved (unsealed) but may occasionally apply to paved tracks as well, that are suitable for two-track vehicles, such as tractors or jeeps.

If the way is not wide enough for a two-track vehicle, it should be tagged as highway=path.

https://cloud.githubusercontent.com/assets/2665840/6720029/9b764622-cd95-11e4-9b9f-de03f3b46af9.jpg

Unclassified Roads

highway = unclassified:

This classification is used for minor public roads typically at the lowest level of the interconnecting grid network. Unclassified roads have lower importance in the road network than tertiary roads, and are not residential streets or agricultural tracks. Unclassified roads are considered usable by motor cars.

Tip: if a minor roads is not a residential street or agricultural track, then mark is as an unclassified road.

https://cloud.githubusercontent.com/assets/2665840/6720329/73181798-cd98-11e4-9e61-fe83df928ed4.jpg

Paths

highway = path:

highway=path is a generic path, either multi-use or unspecified usage, open to all **non-motorized** vehicles . The path may have any type of surface.</h4>

This includes walking and hiking trails, bike trails and paths, horse and stock trails, mountain bike trails as well as combinations of the above.

https://cloud.githubusercontent.com/assets/2665840/14114083/ad4bb6fc-f5a3-11e5-9d5f-8b97f9b431dd.jpg

iD vector alignment

While editing you may encounter a situation where existing features exist that are not aligned well. You need to adjust the existing vectors in iD editor to match the imagery.

https://cloud.githubusercontent.com/assets/2665840/6720917/5ae54f82-cd9e-11e4-955f-16de6bf61ec7.gif

Common Areas

####leisure = common:

Use leisure=common to identify land over which the public has general rights of use for certain leisure activities. More specific tags can be added to provide greater precision.

https://cloud.githubusercontent.com/assets/2665840/6873624/0b85edfc-d488-11e4-9a07-aadb38b0a041.gif

Buildings

Tracing buildings takes good imagery and patience. Take your time and pay attention to angularity, alignment between buildings and reflecting the regularities between buildings.

Select new Area (Keyboard Shortcut: 3) in iD and put a node down at every corner of the buildings roof. Double clicking will complete the area. If you havent formed perfect right angles at every building corner don’t cry, you can ‘shift-click’ on the area to bring up the contextual area menu and use the tool to orthogonolize the area (Keyboard Shortcut: s).

Buildings should be traced as outlines of where the building meets the ground. This last piece is important. The roof outline is often easier to see in the imagery so you’ll find it often traced in OpenStreetMap but it’s wrong. If you see that the outline of the roof you traced does not align with where the building meets the ground you can ‘shift-click’ the path and use the tool to drag the path to the correct position.

https://cloud.githubusercontent.com/assets/7431774/6629871/ee37a952-c8e8-11e4-8e71-a0eda3f814df.gif