Python practice in Geospatial
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Box the Survey
A dataset extent can serve as a quick candidate filter before a more detailed spatial query. The coordinate representation determines what this rectangular extent means.
bbox. Free room.
Clean the Fixes
A batch can contain records outside the expected signed-degree convention. Filtering selects those meeting that convention without asserting that every retained observation is correct.
coordinates. Free room.
To Radians
Python's trigonometric functions take radians. Geographic coordinates here use degrees, while projected map coordinates may use metres or other units. The interface must tell you which conversion is needed.
coordinates. Free room.
Wrap the Meridian
Longitudes separated by a whole turn identify the same meridian. A common representation avoids two names for that meridian, including choosing -180 instead of +180.
coordinates. Free room.
As the Crow Flies
A spherical distance is a useful route estimate. Here Earth is approximated by a sphere of radius 6371 km; this is not an ellipsoidal survey calculation or a road-network distance.
geodesics. Account access required.
Project the Mercator
Mercator expands north/south spacing toward the poles to match its east/west local scale. In the spherical model this preserves local angles, while distorting lengths and areas.
mercator. Account access required.
Steer the Course
A great-circle route begins in a particular direction, but that compass bearing generally changes along the route. This function returns only the initial direction at the starting point.
bearings. Account access required.
Tile the World
XYZ tiles cover the world from west to east. Longitude first becomes a fraction of the full world width, then a position in tile units.
tiles. Account access required.
Hash the Location
Geohash represents each five-bit group with one of 32 symbols. More characters select smaller cells while retaining the earlier prefix.
indexing. Account access required.
Inside the District
A ray starting outside a simple polygon alternates between outside and inside whenever it crosses the boundary. Odd crossing count therefore means inside.
geometry. Account access required.
Measure the Parcel
A closed planar boundary encloses an area that can be calculated by summing signed edge contributions. This avoids dividing the shape into triangles by hand.
geometry. Account access required.
Trace the Perimeter
A fence perimeter adds distances along its boundary, including the last edge back to the start. It is not the direct distance between two arbitrary vertices.
polygons. Account access required.
Blend the Corners
A fractional position needs a blend of the nearby measurements. Each weight describes how much one corner contributes.
interpolation. Account access required.
Fill the Gaps
IDW combines nearby values while retaining the original measurement unit. Dividing by total weight prevents arbitrary weight scale from changing the estimate.
interpolation. Account access required.
Read the Terrain
A slope angle describes how steep the terrain is regardless of which compass direction it faces. It combines both horizontal gradient components.
rasters. Account access required.
Simplify the Coast
A shape-sensitive simplifier retains a vertex when its deviation exceeds a chosen tolerance, then applies the same decision to the subpaths on each side.
geometry. Account access required.
Cluster the Hotspots
DBSCAN connects dense neighborhoods while allowing nearby noncore border points to join. A point first encountered as noise can later belong to a cluster reached from a core.
analysis. Account access required.
Find the Epicenter
A brute-force location search is easy to inspect: evaluate every candidate and retain the best score. Its answer is limited by grid spacing and search extent.
seismology. Account access required.
Open the Store
A final recommendation must satisfy the allowed-zone rule before scores are compared. Otherwise an outside site can win a zero-score tie or be returned when every candidate is disallowed.
engine. Account access required.
Trigger the Detector
An energy increase can suggest an event worth inspecting. A ratio compares the recent window with its background without claiming to identify a seismic phase.
seismology. Account access required.