Generate the r.Geomorphon Forms and Extract the C. Slope.ipynb

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    "__Generate a geomorphon forms layer using the following definition and selection criterion:__<br>\n",
    "slope envelope (flatness): 0 to 0.69°<br>\n",
    "\n",
    "\n",
    "__Extract from the resultant forms a candidate continental slope based on the following selection criteria:__<br>\n",
    "depth envelope: 0 to -3,015 meters<br>\n",
    "sediment thickness envelope: >= 2,897 meters<br>\n",
    "\n",
    "slope is categorized as form type 6"
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    "### Generate the geomorphon forms and ternary layers for c. slope:\n",
    "\n",
    "# In GRASS:\n",
    "r.geomorphon elevation=ETOPO1_bathy_1km@user forms=ETOPO1_slope_gemorph_forms_1km ternary=ETOPO1_slope_geomorph_ternary_1km search=3 skip=0 flat=0.69 dist=0"
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    "### Extract slope from the geomorph forms layer:\n",
    "\n",
    "r.mapcalc --o\n",
    "ETOPO1_cslope_1km = if( ETOPO1_slope_gemorph_forms_1km == 6 & ETOPO1_bathy_1km >= -3015 & Crust_Sed_Thkness_1km >= 2897, 6, null() )\n",
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