Can you give a general overview of the standard zoom levels and talk about the custom zoom levels to or point me to a wiki article that talks more about them? I'm also interested in the custom zoom level. Is there a way in the standard zoom levels to say this zoom level is between this minimum number of feet and this maxium number of feet? Can this be specified in a custom zoom level?
ZoomLevels question
Peter,
For a general overview of our standard zoomlevels, you can check out the preset zoom level section of our WPF Quick Start Guide. This will explain some of the basics of scale and ZoomLevels:
wiki.thinkgeo.com/wiki/Map_Suite_Wpf_Desktop_Edition_Quick_Start_Guide#PresetZoomLevels
There are also a few Code Community projects that will really clarify ZoomLevels and Customizing Zoom Levels:
wiki.thinkgeo.com/wiki/Map_Suite_Wpf_Desktop_Edition_All_Samples#Zoom_Levels_Partitioning
wiki.thinkgeo.com/wiki/Map_Suite_Wpf_Desktop_Edition_All_Samples#Custom_Zoom_Levels
wiki.thinkgeo.com/wiki/Map_Suite_Wpf_Desktop_Edition_All_Samples#GetZoomLevel
Please let me know if you have any further questions.
Thanks,
Phil
I assume the zoomlevels and their scales are based on the MapUnit of the map control, correct?
Map1.MapUnit = GeographyUnit.Meter;
For example, the scale 1:1000 would be in meters in this case.
Also, Can you tell me what the scales are for the standard zoomlevels?
Peter,
On our wiki we have a work in progress Style guide that outlines the scales.
wiki.thinkgeo.com/wiki/Map_Suite_Style_Guide#PresetZoomLevels
Scales for ZoomLevels 1-7 Scales for ZoomLevels 8-14 Scales for ZoomLevels 15-20
1. 590,591,790 8. 4,613,998 15. 36,046
2. 295,295,895 9. 2,306,999 16. 18,023
3. 147,647,947 10. 1,153,499 17. 9,011
4. 73,823,973 11. 576,749 18. 4,505
5. 36,911,986 12. 288,374 19. 2,252
6. 18,455,993 13. 144,187 20. 1,126
7. 9,227,996 14. 72,093
David
What are the UOMs for these scales and what are they based on? For example, does 1:590,591,790 represent for every 1 centimer on the map you have 590,591,790 cenimenters represented in the real world? Is that based on MapUnits?
Peter,
Scale isn’t concerned by the unit of measure. 1:10 for example would mean 1 foot on the map is 10 feet in the real world as well as one inch on the map is one inch in the real world. As you can see the unit doesn’t make a difference it is just the relationship that is important. Imagine that the scale is 1:1 that mean one inch, foot, meter, banana, is represented by 1 inch, foot, meter, banana on the screen. Of course how truly accurate this is depends on the true DPI of the screen and it will only accurate when the DPI is 96. If you had a jumbo-tron and each pixel was one inch itself then the calculation would be off.
David
That makes sense. Thanks.
Peter,
I remember when I was exposed to scale for the first time. I didn’t want to accept it, I really thought it was tied to some unit. The person teaching me used bananas as the unit just to make the point it doesn’t matter. Just wanted to let you know why I threw it in. :-)
David