The Piura MapGive Field Project will introduce field data collection techniques in OpenStreetMap (OSM). The workshop will introduce a suite of skills and tools designed to empower participants with the capability to map Piura comprehensively. The open map data created can be used for various types of analysis and visualization. Data collection will focus on mappable infrastructure and amenities within human geography themes.
Begin by drawing nodes to make a polygon, the last nodes needs to intersect the 1st node. Double-click to complete polygon. After you complete the polygon if you need to straighten out the lines you can use the shortcut ‘Q’.
In JOSM, use the Select tool (shortcut=S) to select objects. Be aware that you can select both nodes and edges. Often you just want to select a building or a highway by just clicking on the edge to modify the tags.
Building polygons should be drawn to overlap the base of the building. There is a noticeable difference between the base of the building and the roof for tall buildings when imagery is taken at an oblique angle. A good strategy for drawing these buildings is to trace the top of the building first, then move the polygon towards the base of the building.
You can draw a point feature in JOSM by just selecting the Draw Nodes tool and double-clicking. You can then add the necessary tags, the correct tag for a water tower is man_made=water_tower
Note that some features such as water towers, pools, and basketball courts can be drawn with either a polygon or a point.
