homolographic

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Maintaining the ratio of parts.

from The Century Dictionary.

• Maintaining or exhibiting the true proportions of parts; preserving true relative areas.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Preserving the mutual relations of parts, especially as to size and form; maintaining relative proportion.
• adjective a method of constructing geographical charts or maps, so that the surfaces, as delineated on a plane, have the same relative size as the real surfaces; that is, so that the relative actual areas of the different countries are accurately represented by the corresponding portions of the map.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective cartography Alternative spelling of homalographic.