Methods and systems are disclosed including dividing a sensitive geographic region into three or more work regions; selecting geo-referenced aerial images for each particular work region such that at least a portion of the particular work region is depicted; transmitting, without information indicative of the geographic location depicted, a first of the images for a first of the work regions to an operator user device; receiving, from the device, at least one image coordinate selected within the first image by the operator, wherein the image coordinate is a relative coordinate based on a unique pixel location within the image raster content of the first image; and transmitting, without information indicative of the geographic location depicted, a second of the images for a second of the work regions to the operator user device, wherein the first and second work regions are not geographically contiguous.