Hello,
Thanks for reaching out to us and sorry have not heard from you. The Spatial Analysis is free during preview. https://azure.microsoft.com/en-us/pricing/details/cognitive-services/computer-vision/
And more configuration information please refer to the below document and let us know if you have more quesrions:
https://learn.microsoft.com/en-us/azure/cognitive-services/computer-vision/spatial-analysis-operations
Regards,
Yutong