topic Best projection for 3D surface area in Ethiopia? in Mapping Questions https://community.esri.com/t5/mapping-questions/best-projection-for-3d-surface-area-in-ethiopia/m-p/145732#M1650 <HTML><HEAD></HEAD><BODY><P>Dear all,&nbsp;</P><P></P><P>I am currently working on mapping some forest areas in ethiopia and have experimented now with some projections here (Lambert Azimuthal Equal Area and African Albert Equal Area Cone) and have for my forest drastic differences in 3D surface calculation. My question for you now, if you can help me, would be, if you can help me in finding out what would be the most accurate projection for this case</P><P></P><P>Maybe I can just show you the calculations in ha&nbsp;</P><TABLE style="border: none;"><TBODY><TR><TD style="border: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"></TD><TD style="border: solid windowtext 1.0pt; border-left: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>WGS</SPAN></P></TD><TD style="border: solid windowtext 1.0pt; border-left: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>LAMBERT AZIMUTHAL EQUAL AREA</SPAN></P></TD><TD style="border: solid windowtext 1.0pt; border-left: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>AFRICAN ALBERT EQUAL AREA CONE </SPAN></P></TD></TR><TR><TD style="border: solid windowtext 1.0pt; border-top: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>Beterya 3D</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>613 ha</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>561 ha</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>615 ha</SPAN></P></TD></TR><TR><TD style="border: solid windowtext 1.0pt; border-top: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>Beterya 2D</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>539 ha</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>489 ha</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>541 ha</SPAN></P></TD></TR><TR><TD style="border: solid windowtext 1.0pt; border-top: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>2D calc. Normal: <STRONG>539</STRONG></SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>&nbsp;</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>&nbsp;</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>&nbsp;</SPAN></P></TD></TR></TBODY></TABLE><P>The calculations are done for selling timber.&nbsp;<BR />Input is appreciated!<BR /><BR />Kind regards,&nbsp;<BR />Michele</P></BODY></HTML> Mon, 11 Mar 2019 19:48:46 GMT Michèlevon_Kocemba 2019-03-11T19:48:46Z Best projection for 3D surface area in Ethiopia? https://community.esri.com/t5/mapping-questions/best-projection-for-3d-surface-area-in-ethiopia/m-p/145732#M1650 <HTML><HEAD></HEAD><BODY><P>Dear all,&nbsp;</P><P></P><P>I am currently working on mapping some forest areas in ethiopia and have experimented now with some projections here (Lambert Azimuthal Equal Area and African Albert Equal Area Cone) and have for my forest drastic differences in 3D surface calculation. My question for you now, if you can help me, would be, if you can help me in finding out what would be the most accurate projection for this case</P><P></P><P>Maybe I can just show you the calculations in ha&nbsp;</P><TABLE style="border: none;"><TBODY><TR><TD style="border: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"></TD><TD style="border: solid windowtext 1.0pt; border-left: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>WGS</SPAN></P></TD><TD style="border: solid windowtext 1.0pt; border-left: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>LAMBERT AZIMUTHAL EQUAL AREA</SPAN></P></TD><TD style="border: solid windowtext 1.0pt; border-left: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>AFRICAN ALBERT EQUAL AREA CONE </SPAN></P></TD></TR><TR><TD style="border: solid windowtext 1.0pt; border-top: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>Beterya 3D</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>613 ha</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>561 ha</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>615 ha</SPAN></P></TD></TR><TR><TD style="border: solid windowtext 1.0pt; border-top: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>Beterya 2D</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>539 ha</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>489 ha</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>541 ha</SPAN></P></TD></TR><TR><TD style="border: solid windowtext 1.0pt; border-top: none; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>2D calc. Normal: <STRONG>539</STRONG></SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>&nbsp;</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>&nbsp;</SPAN></P></TD><TD style="border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; padding: 0cm 5.4pt 0cm 5.4pt;" width="150"><P style="margin-bottom: .0001pt;"><SPAN>&nbsp;</SPAN></P></TD></TR></TBODY></TABLE><P>The calculations are done for selling timber.&nbsp;<BR />Input is appreciated!<BR /><BR />Kind regards,&nbsp;<BR />Michele</P></BODY></HTML> Mon, 11 Mar 2019 19:48:46 GMT https://community.esri.com/t5/mapping-questions/best-projection-for-3d-surface-area-in-ethiopia/m-p/145732#M1650 Michèlevon_Kocemba 2019-03-11T19:48:46Z