3 ms·

Well if I still use the Web Mercator I'm still going to have widely inaccurate feature rendering between zoom levels. Thank you for trying, I guess I should be

by th0ma5 12y ago

Well if I still use the Web Mercator I'm still going to have widely inaccurate feature rendering between zoom levels. Thank you for trying, I guess I should be asking these questions in GIS forums instead.

maxerickson 12y ago
The problems with Web Mercator and spatial analysis are due to the way the projected data is distorted: http://blogs.esri.com/esri/arcgis/2010/03/05/measuring-distances-and-areas-when-your-map-uses-the-mercator-projection/ http://blogs.esri.com/esri/arcgis/2010/03/05/measuring-dista... The zoom level bug you are hung up on was due to the way web mercator was implemented in Osmarender. This is why people are answering your concerns about teh zooming by pointing out osmarender is no longer used. So no, don't use web mercator for analysis. But only worry about inconsistent rendering across zoom levels if you are using Osmarender.
- th0ma5 12y ago
  Thank you!! Yeah I've never used OSM render, it is just the only place I had been able to find discussion about the inaccuracies of the projection. It also exists in all online slippy maps I've used from the latest OpenLayers to the latest Google Maps. Thanks again!
  - rmc 12y ago
    There is lots of discussion about various map projections. There's even a XKCD strip about it. http://xkcd.com/977/ http://xkcd.com/977/
    - th0ma5 12y ago
      Thank you, however that is not related to the issues I'm discussing.
rmc 12y ago
The features don't change between zoom levels. They will be displayed the same. The bug you're referring to is with a piece of software that isn't been used any more. All projection systems have "inaccuracies". It has literally been mathematically proven ( http://en.wikipedia.org/wiki/Theorema_Egregium http://en.wikipedia.org/wiki/Theorema_Egregium ). Never the less, GIS people can, and do, use many projections professionally.
- th0ma5 12y ago
  Thank you, I know you're trying to help, but this issue as the other commenter replied is not one due to inaccuracies of projections per se, but specifically the method by which layers are divided for use in web page interfaces.

by th0ma5 12y ago

maxerickson 12y ago

The problems with Web Mercator and spatial analysis are due to the way the projected data is distorted: http://blogs.esri.com/esri/arcgis/2010/03/05/measuring-distances-and-areas-when-your-map-uses-the-mercator-projection/ http://blogs.esri.com/esri/arcgis/2010/03/05/measuring-dista... The zoom level bug you are hung up on was due to the way web mercator was implemented in Osmarender. This is why people are answering your concerns about teh zooming by pointing out osmarender is no longer used. So no, don't use web mercator for analysis. But only worry about inconsistent rendering across zoom levels if you are using Osmarender.

th0ma5 12y ago
Thank you!! Yeah I've never used OSM render, it is just the only place I had been able to find discussion about the inaccuracies of the projection. It also exists in all online slippy maps I've used from the latest OpenLayers to the latest Google Maps. Thanks again!
- rmc 12y ago
  There is lots of discussion about various map projections. There's even a XKCD strip about it. http://xkcd.com/977/ http://xkcd.com/977/
  - th0ma5 12y ago
    Thank you, however that is not related to the issues I'm discussing.

rmc 12y ago

The features don't change between zoom levels. They will be displayed the same. The bug you're referring to is with a piece of software that isn't been used any more. All projection systems have "inaccuracies". It has literally been mathematically proven ( http://en.wikipedia.org/wiki/Theorema_Egregium http://en.wikipedia.org/wiki/Theorema_Egregium ). Never the less, GIS people can, and do, use many projections professionally.

th0ma5 12y ago
Thank you, I know you're trying to help, but this issue as the other commenter replied is not one due to inaccuracies of projections per se, but specifically the method by which layers are divided for use in web page interfaces.