|Informed Guesses, Undocumented Aerial or Dung Surveys and GIS Extrapolations||0||0||1,040||0|
|Other Guesses and Other Extrapolations||0||0||0||2,100|
No changes between current and previous report.
|Survey Details2||Number of Elephants||Area||Map Location|
|Input Zone||Type||Reliab.||Year||Estimate||95% C.L.||Source||PFS3||(km²)||Lon.||Lat.|
|Batha Guera Region||OG3||E||500||Daboulaye & Thomassey, 1990||1||149,993||18.8E||13.0N|
|Chari Baguirmi Region||OG3||E||300||Daboulaye pers. comm., 1995||1||96,278||16.5E||11.6N|
|Chari West Region||OG3||E||800||Daboulaye pers. comm., 1995||1||45,315||18.5E||9.0N|
|Lac Tchad||OG3||E||100||Daboulaye & Thomassey, 1990||2||23,733||14.5E||13.7N|
|Salamat Region||OG3||E||400||Daboulaye pers. comm., 1995||1||64,257||20.4E||10.0N|
|Zakouma National Park||AS3||D||1991||1,040||DPNRF, 1991||2||3,156||20.7E||11.2N|
* Range of informed guess
1Key to Causes of Change (only tracked since 2007): DA: Different Area; DD: Data Degraded; DT: Different Technique; NA: New Analysis; NG: New Guess; NP: New population; PL: Population Lost; RS: Repeat Survey (RS ́ denotes a repeat survey that is not statistically comparable for reasons such as different season); –––: No Change
2Key to Survey Types: AC: Aerial Count, not specified; AS: Aerial Sample Count; AT: Aerial Total Count; DC: Dung Count; EX: Extrapolation from GIS; GD: Genetic Dung Count; GS: Ground Sample Count; GT: Ground Total Count; IG: Informed Guess; IR: Individual Registration; OG: Other Guess. Survey Type is followed by an indicator of survey quality, ranked from 1 to 3 (best to worst). Survey Reliability is keyed A-E (best to worst) as outlined in this table.
3PFS: Priority for Future Surveys, ranked from 1 to 5 (highest to lowest). Based on the precision of estimates and the proportion of national range accounted for by the site in question, PFS is a measure of the importance and urgency for future population surveys. All areas of unassessed range have a priority of 1. See Introduction for details on how the PFS is derived.