# Geoviews hv.DynamicMap + gv.WMTS skewing

**URL:** <https://discourse.holoviz.org/t/geoviews-hv-dynamicmap-gv-wmts-skewing/457>\
**Category:** GeoViews\
**Created:** [April 9, 2020, 2:51am UTC](https://discourse.holoviz.org/t/geoviews-hv-dynamicmap-gv-wmts-skewing/457 "2020-04-09T02:51:01Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![digitaltopo](https://discourse.holoviz.org/letter_avatar_proxy/v4/letter/d/5e9695/32.png) [@digitaltopo](https://discourse.holoviz.org/u/digitaltopo)\
**Post date:** [April 9, 2020, 2:51am UTC](https://discourse.holoviz.org/t/geoviews-hv-dynamicmap-gv-wmts-skewing/457/1 "2020-04-09T02:51:01Z")

</div>

I’m using a dynamic map whose call back returns a gv.WMTS and a gv.Shape elements… when my callback runs changing the selected shape data, the map seems to get reprojected/skewed. I’m using `framewise=True` in the `gv.Shape` options, and I think this is the root of it. If I leave off `framewise` the map does not reposition to center around the `gv.Shape` but it does NOT skew it.

```python
import holoviews as hv
import geoviews as gv
import panel as pn
from shapely.geometry import shape

pn.extension()
gv.extension('bokeh')

feature_collection = {
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Polygon",
        "coordinates": [
...
}
selector_widget = pn.widgets.Select(options=[x for x in range(len(feature_collection['features']))])

@pn.depends(selector_widget)
def render_callback(value):
    return gv.tile_sources.OSM() * gv.Shape(shape(feature_collection['features'][value]['geometry'])).options(framewise=True, fill_alpha=0)
    
pn.Column(
    selector_widget,
    hv.DynamicMap(render_callback).options(height=400, responsive=True),
    sizing_mode="stretch_width"
)

```

Gist: [https://gist.github.com/digitaltopo/bf9a124f9bdf79c9d605a9c52f74cb82](https://gist.github.com/digitaltopo/bf9a124f9bdf79c9d605a9c52f74cb82)  
Binder example:  
[https://mybinder.org/v2/gist/digitaltopo/bf9a124f9bdf79c9d605a9c52f74cb82/master](https://mybinder.org/v2/gist/digitaltopo/bf9a124f9bdf79c9d605a9c52f74cb82/master)

---

<div class="post-metadata">

**Author:** ![digitaltopo](https://discourse.holoviz.org/letter_avatar_proxy/v4/letter/d/5e9695/32.png) [@digitaltopo](https://discourse.holoviz.org/u/digitaltopo)\
**Post date:** [April 18, 2020, 1:09am UTC](https://discourse.holoviz.org/t/geoviews-hv-dynamicmap-gv-wmts-skewing/457/2 "2020-04-18T01:09:39Z")

</div>

I was able to fix this issue by using `data_aspect=1` (locking the data aspect ratio) for the `gv.Shape` element. This limits the aspect ratios available for plot size but the result is that skewing doesn’t happen. If anyone has any additional information, please add!