Hfrhyu

I just started learning about ArcGIS.

I am building a webapp (django) and we need map images (jpg) of a given location (lat,long), using various basemaps (topology, satellite, etc). Later I need to layer shapefiles on top.

The Google static image API does exactly what I need. Unfortunately, they only provide 3 different types of maps and we need other basemaps.

ArcGIS has all the basemaps we need. But, how do I use it?

I can see they have an ArcGIS API for Python and an ArcGIS REST API. But, browsing those docs I cannot find a way to generate map images.

Basically, I need a REST function that implements the following: "Generate a .jpg of map range lat,long to lat1,long1 using Basemap XYZ (and layer shapefile A.shp on top)". Does such a thing exist? in arcgis, or anywhere?

One possible answer, following @GeospatialInformationTech hints (I think), is to directly access the tiles from the server.

For arcgisonline.com the various map services are listed here. Each one of them (I think) provides the map tiles at URLs that have the following pattern:

https://services.arcgisonline.com/arcgis/rest/services/service_name/MapServer/tile/zoom/ytile/xtile

The mapping from lat-long to xtile,ytile,zoom is explained here and here. Basically use the function

import math
def deg2num(lat_deg, lon_deg, zoom):
 lat_rad = math.radians(lat_deg)
 n = 2.0 ** zoom
 xtile = int((lon_deg + 180.0) / 360.0 * n)
 ytile = int((1.0 - math.log(math.tan(lat_rad) + (1 / math.cos(lat_rad))) / math.pi) / 2.0 * n)
 return (xtile, ytile)

As an example deg2num(34,-81,13) returns (2252, 3272) which becomes the URL

https://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer/tile/13/3272/2252 which seems roughly correct.

This is what I've got. I don't know if this is the best way to get an image from a lat-long. Maybe someone knows an easier method?

One problem is that these images are always 256x256. I might need different aspect ratios.

ESRI basemaps are XYZ tile server just like 90% of all online basemaps (WMTS is also XYZ naming). Check out URL to basemaps at Leaflet provider's plugin. Zoom Column Row are the keys all JavaScript mapping libraries enabling quickly adding tile URL. http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/z/y/x.png

take a look at the TileLayer Plugin for QGIS and then add XYZ TileLayer Reference Grid you will clearly see Zoom, Column and Row information.
Otherwise look at https://www.maptiler.com/google-maps-coordinates-tile-bounds-projection/

If you are using a mapping framework that does not support tile servers then switch. I recommend going with OpenLayers or ArcGIS JavaScript.