suggest -o if projection error shows up

grass/terrain_modeling.html

@@ -42,7 +42,7 @@ <h3>Start GRASS GIS</h3>
 <pre><code>
 cd
 </code></pre>
-Download all files (see above)
+Download all files one-by-one (see above)
 to the selected directory. Now you can use the commands from the assignment requiring the file
 without the need to specify the full path to the file.
 
@@ -57,7 +57,8 @@ <h3>Analyze bare earth and multiple return lidar data properties by binning</h3>
 lasinfo tile_0793_016_spm.las
 </code></pre>
 Class 2 represents bare earth points.<br>
-Now we import bare earth points and first return points separately:
+Now we import bare earth points and first return points separately (add -o flag to the command 
+if you are getting error that the projection does not match the project projection):
 
 <pre><code>
 v.in.lidar -t input=tile_0793_016_spm.las output=elev_lid793016_be class_filter=2
@@ -68,7 +69,8 @@ <h3>Analyze bare earth and multiple return lidar data properties by binning</h3>
 use v.in.lidar GUI dialog to browse to get the path to the files.
 <p>
 Set the region from the imported point file with resolution of 1 meter.
-Compute raster maps (with <em class="module">r.in.lidar</em>) representing number of points per 1 m grid cell.<br>
+Compute raster maps (with <em class="module">r.in.lidar</em>) representing number of points per 1 m grid cell
+(add -o flag to the r.in.lidar command if you are getting error that the projection does not match the project projection):
 Compare point densities for bare earth, first return.
 <span class="question">How do the point densities for bare earth and first return compare?
 </span>