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Currently, if you use the -a flag with g.region it will align the region exactly to match the resolution of a map (e.g. g.region -a rast=myrast will set the region to exactly the resolution of myrast regardless of the extents) or the resolution specified in the res or ewres/nwres fields (e.g. g.region -a n=523 s=15 res=10 will adjust the extents a little to make sure the resolution is exactly 10).<div><br class="webkit-block-placeholder"></div><div>However, -a is ignored if the map argument (rast=) or resolution arguments are blank. This means that if you want to change the extents and keep your current resolution, you need to specify the -a flag AND explicitly specify the resolution. Otherwise, the resolution will be adjusted slightly.</div><div><br class="webkit-block-placeholder"></div><div>Could this be modified so that when the -a flag is used and resolution is NOT specified and a map is NOT specified (i.e., only changing extents) it aligns to the current resolution? That is, respect the -a flag when res/ewres/nsres= is blank and rast= is blank.<br><div><br class="webkit-block-placeholder"></div><div>Michael<br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">____________________</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">C. Michael Barton, Professor of Anthropology</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Director of Graduate Studies</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">School of Human Evolution & Social Change</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Center for Social Dynamics & Complexity</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Arizona State University</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Phone: 480-965-6262</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Fax: 480-965-7671</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">www: <<a href="http://www.public.asu.edu/~cmbarton">www.public.asu.edu/~cmbarton</a>></font></div></div></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline"> </div><br></div></div></body></html>