tilemill | TileMill is a modern map design studio | Map library

I am working on an iOS application. Where I show the Elevation and Topography map of a certain area. I have managed to download the .hgt file within app from here.

So far I am able to extract the Elevation from the hgt file. Now I have to also show the Terrain Map for that area. I have been searching about it and I think I can't create terrain map directly with hgt file within iOS application. I have to use GRASS GIS, SRTM2OSM or TileMill to create terrain map and then use it in application.

Can please anyone direct me what I can do here and how to proceed.

I have asked to not to use any kind of map for this. So basically I have to create the map by using core drawing, and I have no idea about it.

Something Like this without the text:

I'm plotting ACS data (counts of low-income children) for each county across the entire U.S. I don't have any markers, just a county shapefile and 6 values for each county that are in separate layers.

Unsurprisingly this is too large for browsers to handle. I've seen some similar questions here that deal with clustering, but since I have nothing to cluster I'm starting a new question.

I've tried breaking it up into 6 regional maps, but even those are too much.

Is there some way to lower the footprint, but still have all the county specific data?

I've looked at tilemill and other options for only loading the data the user is currently viewing and based on the zoom level, but I can't find any information on how to go from an R generated leaflet map to something like that. Alternatives using this route are useful as well.

here's what I have:

• SQL table/CSV file with "tile XYZ" coordinates (web mercator tile coordinates) and "data/color"

  X Y Z Color 13 13 5 yellow 13 14 5 green 13 14 5 red ...

• data structure very easy, no fancy stuff needed, I can draw the pngs by code.

• amount of data is large, i.e. worldwide tiled, say zoomlevel 15

what I want:

• png tiles
• underlying data should not be accessible
• show the png tiles as a webpage map with help of leaflet/google maps api

problem/question:

• too much data to generate ALL tiles worldwide before (takes days)
• I was therefore thinking about a dynamic caching/tile creation algorithm (maybe create zoomlevel 0-9 before, higher zoom levels created dynamically)
• it seems there are many tools out there (TileMill, TileStache, ArcGIS Server, etc) but all of them seem to have a high learning curve or are meant for more complex tasks.
• is there a way to run a lean server that exactly fits my needs? Maybe with a php script that queries the database, draws the png and feeds that to the map on-demand? how would that work exactly? What would be a clever solution?

Thanks so much.

Trying to create a custom world map texture with tilemill to load into leafletjs. I have downloaded a free .tiff file from natural earth data and loaded it into tilemill. When i want to export however, i notice alot of jagged edges mainly around greenland/canada on the lowest zoom level.

a few zoom levels down and it seems ok again. After exporting the tiles to png's the jagged edges stay. How can i improve the quality of these images?