caption: contour lines follow certain rules
exif: {"Image DocumentName": "Contour lines follow certain rules.", "Image ImageDescription": "Contour lines on topographic maps can help you visualize landforms. Contour lines never cross, because each line represents an exact elevation. Circles show highest and lowest points. Contour lines form closed circles around mountaintops, hilltops, and the centers of depressions (which are sunken areas in the ground.) Sometimes elevation is written in meters or feet in the middle of the circle. Contour interval is always the same on a map. Difference in elevation from one contour line to the next. Can differ from map to map, but it is always the same on a particular map. Index contour lines mark elevations. The darker contour lines on a map are called index contour lines. Numbers that indicate elevations are often written on these lines. To calculate higher or lower elevations, count the number of lines above or below an index line, then multiply that number by the contour interval.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}