I have an electricity distribution database in which the coordinates used are in the SAD69 system. I'd like to convert this data to longitude and latitude, but I do not find formulas anywhere. Could someone explain how I do this conversion, or indicate where I find this information? For example, the coordinate in SAD69 (x = 483473, y = 7415400) would correspond to which coordinate of longitude and latitude?

  • Which software are you using? – Erik May 24 '19 at 14:04
  • I am not using any software. I have a dataset from the Energy Company of a city in Brazil (data is in .csv) and I am reading and working in Python. My objective is to get the mathematical formula to convert the data in SAD69 myself. – donut May 24 '19 at 14:36
  • Would downloading QGIS and transforming the data into WGS84 be an option? – Erik May 24 '19 at 14:41
  • It would be better to know the formula for conversion since my dataset contains 36000 points of coordinates. But thank you anyway, I will consider your suggestion! – donut May 24 '19 at 14:49
  • QGIS can handle 36 k features. – Erik May 24 '19 at 15:03

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