Table 2.

Accuracy of previous surveys at nature conservation areas (open grasslands).

GSD	Map Scale	Max. Distance (cm)	Mean (pixel)	Mean (cm)	Stdev. (pixel)	RMSE (pixel)	Number of Checkpoints
40	1:4800	78	0.74	29.67	0.53	0.89	16
20	1:2400	42	0.80	16.00	0.60	0.98	16
10	1:1200	15	0.88	8.78	0.39	0.95	16
5	1:600	11	0.98	4.93	0.6	1.15	15
2	1:240	8	1.87	3.73	1.19	2.19	15
1	1:120	5	3.46	3.46	1.41	3.72	15
0.5	1:60	4	4.13	2.07	2.20	4.65	15