I have a government-sourced geotiff which I have imported into ArcMap 10.4 as a raster basemap. In a TIFF viewer it displays correctly but in ArcMap it appears vertically squashed by roughly 20%.
The data frame coordinate system is GCS_WGS_1984 WKID: 4326. And here is some data provided to me along with the tiff file:
Panel Limits: Lat -34 5 55.812 to -33 23 59.347 Lon 151 7 58.170 to 151 39 42.778
Referencing: Geographic Lat/Long Spheroid: WGS84 Horizontal Datum: WGS 84 Scale: 1:75000 Image Size: 7258 cols x 10867 rows Image Resolution: 254 dots-per-inch Number of Colours: 27 TIFF Version #: 42 GeoTIFF Version #: 1 TIFF Compression: Packbits
Why does it appear squashed, and how can I fix it?
I found this but it did not seem to help: https://geonet.esri.com/thread/34535. Unable to independently verify the geotiff is WGS84. I am running Windows 10 Pro under Parallels on a MacBook Pro.
What is stranger, I also have a KML map of the same area and when I alternate between the two maps in ArcMap, by disabling one of them, I can see that they are exactly coincident. In other words, both are squashed, by the same amount.
The only thought I had was that one degree of longitude, in metres, varies with the cosine of the latitude, and coincidentally 1 - cos (33.5) is about 20%. Could that have something to do with it? Clutching at straws here.