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Update geospatial concepts episode
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cforgaci committed Feb 18, 2024
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Expand Up @@ -7,9 +7,9 @@ author: 'Ana Petrović'

::: questions

- How do you describe the location of a geographic feature on the surface of the earth?
- How do you describe different types of CRS?
- How do you decide on what CRS to use?
- How do I describe the location of a geographic feature on the surface of the earth?
- What is coordinate reference system (CRS) and how do I describe different types of CRS?
- How do I decide on what CRS to use?

:::

Expand Down Expand Up @@ -75,11 +75,14 @@ In this workshop, we use two CRS shown in @tbl-crs.

| | WGS 84 (EPSG:4326) | Amersfoort / RD New (EPSG:28992) |
|-----------------|----------------------------|----------------------------|
| Properties | Dynamic (relies on a datum which is not plate-fixed)<br>Celestial body: Earth<br>Prime meridian: Greenwich | Static (relies on a datum which is plate-fixed)<br>Ellipsoid: Bessel 1841 |
| Definition | Dynamic (relies on a datum which is not plate-fixed) | Static (relies on a datum which is plate-fixed) |
| Celestial body | Earth | Earth |
| Ellipsoid | WGS-84 | Bessel 1841 |
| Prime meridian | International Reference Meridian | Greenwich |
| Datum | World Geodetic System 1984 ensemble | Amersfoort |
| Projection | Geographic (uses latitude and longitude for coordinates) | Projected (uses meters for coordinates) |
| Method | Lat/long (Geodetic alias) | Oblique Stereographic Alternative |
| Units | degrees | meters |
| Units | Degrees | Meters |


: Main properties of WGS 84 and Amersfoort / RD New coordinate reference systems {#tbl-crs}
Expand Down Expand Up @@ -171,6 +174,7 @@ Correct answer: b. EPSG:28992

- Each location on the Earth has its geographical latitude and longitude, which can be transformed on a plane using a map projection.

- Depending on the research question, we need a global or local CRS suitable properties.
- Depending on the research question, we need a global, regional, or local CRS suitable properties.


:::

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