It might turn out to be unusable or too time-consuming for your purpose. Also check the community support and do a quick browse to see how much you can learn about that type of data before you commit to it. In case of precise maps, check if the conversion will lead to any losses - and if it does, determine whether those losses are acceptable. My best advice for you, especially if working from an obscure data source, is to invest early in understanding the data standard and checking how difficult it will be to convert into a widely supported and well-documented system. In mapping projects, this area often contains the most risk or unknowns. I spent a lot of time trying to figure out the conversion on my own before finally settling for an online converter, and found a way to automate providing the input to some extent. In order to use PUGW-1992 coordinates, I needed to convert them to WSG84, then use EPSG:3857 with OpenStreetMap. This is how I came to learn that countries have their own projected coordinate reference systems! Polish public information follows a different system than, say, Germany not to mention a system that's unusable by any big map provider. For the development, I've been using public information on multiple parcels around the city. My side project is focused on the city of Kraków, Poland, where I'm from. If you're working with data that covers a large area or for which accuracy over small areas is not critical, then EPSG:4326 will typically be an appropriate choice. As it’s not using the projection, it doesn't have the distortion issues of the Web Mercator. It represents Earth as a three-dimensional ellipsoid. EPSG:4326ĮPSG:4326, also known as the WGS84 projection (because it’s based on WGS84’s ellipsoid), is a coordinate system used in Google Earth and GSP systems. If you're working with data that covers a small area and you need to preserve the shape of the features, then EPSG:3857 might be the right choice. In practice, this means that if you’re making a web map featuring the tiles from services such as Google Maps or Open Street Map, they will be in Spherical Mercator EPSG:3857 and therefore your map has to have the same projection. It rose to prominence with the Google Maps adoption in 2005, and its currently used by most web mapping applications, including CARTO, Mapbox, Bing Maps, OpenStreetMap, and Esri. This square can be thought of as a pixel, making it useful for web small-scale mapping. The Web Mercator projection is a variant of the Mercator projection that shows the world as a square, while the typical Mercator projection is cylindrical. It is based on the WGS84 geographic CRS, but uses the Mercator projection to map the Earth's spherical surface onto a flat, two-dimensional plane. EPSG:3857ĮPSG:3857, also known as Web Mercator projection, is a projected CRS commonly used for online maps and web mapping applications. WGS84 serves as a base in two widely used projected coordinate reference systems: EPSG:3857 and EPSG:4326, which use different projection methods and have different properties. WGS84 uses a three-dimensional ellipsoidal model of the Earth, with positions that are defined using latitude, longitude, and altitude coordinates. It is used as the default for GPS coordinates, and is widely used in mapping, GIS applications, and for military purposes. World Geodetic System 1984 (WGS84) is the most popular CRS. EPSG:3857, on the other hand, is a projected system that uses a flat, two-dimensional plane to represent the Earth's surface and x/y coordinates instead of latitude/longitude in a process called projection. It means that they use latitude and longitude coordinates to specify a location on the surface of the earth. Knowingly, or unknowingly, all web developers will come across these. The three most common systems are WGS84, EPSG:4326, and EPSG:3857. Knowing the standard of the data that you're planning to use is important, as different mapping services operate on different systems that are known as coordinate reference systems (CRS). The Three Most Common Coordinate Reference Systems
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